Well, fret not – I’m here to help unravel the mystery for you. The Meaning of ISTG in Text. ISTG Meaning. ISTG is an acronym that stands for ‘I Swear To God. I just won the jackpot on the lottery ticket I bought yesterday, ISTFG! 5. More violent then just I Swear To GodISTG is an acronym that is short for “I swear to God”. ISTFG means “I Swear To Fing God” and is typically used in informal texting to express frustration or disbelief. ISTG has multiple definitions that can be used in various settings. This is only for close friends. The phrase “I swear to God” has been used for hundreds of years and is basically taken from the Old English word “swear” which means an oath. Let’s talk about the other meanings of this common abbreviation and find out what it means for different people in different contexts. ISTFG, if you don’t stop playing your music so loudly, I’m going to lose it. "ISTG" stands for "I swear to God," an acronym usually used to express the seriousness of a situation or assure you're. It can be a powerful tool for self-motivation and encouragement. ISTFG. The phrase “I swear to God” has been used for hundreds of years and is basically taken from the Old English word “swear” which means an oath. It’s a widely used acronym in text messaging and online chatting on social networking sites. While the presence of the word “God” might indicate some religious connotation, it’s not a religious term at all. The ISTG acronym is commonly used in response to a person who doubts something that you said. Sub the Gamer security threat group. This abbreviation is commonly used in informal conversations on various digital platforms, such as text messages, social media posts, and online forums. This abbreviation is commonly used in informal conversations on various digital platforms, such as text messages,. TikTok lingo is hard to keep up with. ”. Simply put,. ” It is often used to emphasise the truthfulness of a statement or convey the seriousness of a situation. As in, I swear that actually happened. The slang abbreviation ISTG is frequently used as an interjection to express emotion or as an attestation of honesty. What Does ISTG Mean? In internet chatting and text messaging, the acronym “istg” actually means the phrase “I swear to God. It’s often used as an exclamation or a way to emphasize something and can be written in lower or upper case letters. Some of these words and acronyms are used on other video games and social media platforms too. Pushin P is a popular phrase in the Bay Area and Texas that was popularized by Atlanta rapper Gunna. What does 'ISTG' mean? "ISTG" stands for "I swear to God," an acronym usually used to express the seriousness. suggest new definition. Here’s our round-up of the latest Roblox slang. ABC means asking another player (or telling another player you’re ready) to make an offer, trade or perform a task in Roblox, such as roleplaying in a game. -ISTG that was the best pizza ever! -I put your racket back in your duffle bag istg. For example: What does ISTG mean? ISTG is an acronym that means I swear to God. This initialism should be avoided in professional situations or in conversing with someone who is religious. ISTG stands for "I Swear to God. On the internet, there’s a lot of jargon and abbreviations that often confuse even the most seasoned internet user. ” It is commonly used in text messaging and online chat to emphasize the truth or sincerity of a statement. ” Kids often use this to express frustration or exasperation. It is very similar to ISTFG meaning, however, there are additional letters added within the acronym. When someone doubts something you said, using ISTG is a way to make a solemn oath that most people respect and are more likely to believe. " The abbreviation ILYSM is used with the meaning "I Love You So Much" as an expression of affection. ISTG is commonly used in text messages and other social media conversations as a way to emphasize the truth or sincerity of a statement. ”. ISTG is used to express frustration or annoyance at something or to show emphasis on a statement. It is very similar to ISTFG meaning, however, there are additional letters added within the acronym. Guarantee. In texting lingo, “istg” simply stands for “I Swear To God”. 3. It is commonly used as an exclamation or interjection. The abbreviation “ISTG” is a shorthand. The abbreviation ISTG is widely used in text messaging and online chat with the meaning "I Swear To God. This phrase should only be used in casual conversation. Swear to fucking god. It is a commonly used slang expression used to emphasize that someone is telling the truth, or to add emphasis to a statement. Use Cases & Examples. You’ll find it all over the internet, from social media platforms like twitter and instagram to direct messages between friends. It is a reference to swearing or commitment to God that is not something to take lightly as it is a risk that the person who is saying it could be punished in the event of lying. " It is an internet acronym used in online chat to express frustration, surprise, or vehement assertion. I swear to God. Usually, students or the young generation use this acronym. Further Reading: What Does NFS Mean: Here Is All-inclusive Information You Need to Know. The phrase originated as a method for people to express a greater level of certainty about a statement they’re making in a conversation. " ISTG is used to add emphasis to a statement (usually a promise, threat,. This abbreviation is typically used to express surprise, confusion, disbelief, or. LFG meaning: let's freaking go. Matching search results: Since the STG meaning is often expressed fully when in a verbal conversation, the term STG should only be used in casual conversations via text or on social media. What does ISTFG mean? This page is about the various possible meanings of the acronym, abbreviation, shorthand or slang term: ISTFG. ”. One such popular slang on platforms like Snapchat is ‘ISTG’. But while the slang term ISTG is harmless, other teenage slang terms could indicate that your teen is talking about risky behaviors or communicating with potentially dangerous people. . In simple terms, “istg” stands for “I swear to God,” a popular expression used to emphasize the truthfulness or intensity of a statement. Correct: ISTG Correct: istg Incorrect: iSTG Usage Use of the abbreviation can be found in the following places. By using “ISTG,” individuals can emphasize the sincerity or truthfulness of their statements, especially when sharing surprising facts or. The origin of ‘ISTG’ can be traced back to the phrase “I swear to God,” which. This initialism should be avoided in professional situations or in conversing with someone who is religious. Capitalization The slang term and abbreviation “ISTG” is typically spelled in ALL CAPS or all lowercase letters. What Does ISTG Mean? Introduction. ISTG stands for “I swear to God” in texts and on social media apps. "I swear to. ISTG Meaning. It can be used to convey extreme seriousness, exasperation, or surprise, and is usually used outside of a serious religious. This phrase has a couple of variants, S2G and ISTG, and is frequently used in texting or on social media. They are there for each other on the good days and the bad days. It’s used to convey a deep sense of seriousness about a situation or to emphasize a point being made. It can be used as an exclamation, where users are expressing disbelief or shock. There needs to be a TikTok user manual that includes a glossary because new abbreviations and slang words are constantly being churned out and I, a millennial, cannot keep up. ”. Use Cases & Examples. Start the day smarter. It is an expression used to emphasize the truthfulness or sincerity of a statement. What Does ISTG Mean In Texting? ISTG is an acronym used for “I Swear To God. ISTG is short for "I swear to God. It is typically used to show appreciation of an act of kindness by a loved one. STFU is an acronym that means "shut the fuck up. If you see someone using ISTG when texting, they’re probably emphasizing how serious they are about something. Testify. This phrase is often used on social media while making public posts or in private chats. IYKYK meaning: if you know, you know. What Does Istg Mean? The acronym ISTG stands for “I swear to God. ISTG stands for “I swear to God. Use ISTG to show you’re not joking about something, or to express annoyance or frustration with something (or someone). Summary: · The added I at the beginning just refers to the person that is saying this, so ISTG means “I Swear To God”. ISTFG. The slang abbreviation ISTG is frequently used as an interjection to express emotion or as an attestation of honesty. The phrase “so what” is often used to express indifference or dismissiveness about the topic at hand. What does 'ISTG' mean? "ISTG" stands for "I swear to God," an acronym usually used to express the seriousness of a situation or assure you're not joking when sharing a surprising fact. Definition of ISTG in Slang/Internet Slang. Every TikTok user's FYP. ISTJ types like to have clear goals and realistic deadlines, and to work with factual data to solve problems and monitor progress. One of the main uses of ISTG is in text messages or chats, either between friends or in a. OTP meaning: one true pairing (a couple that fans prefer to all other. ISTG Meaning= Expression of Disbelief4. This should not be used in any formal setting, no matter how informal it may seem, via social media or text. Key Takeaways: ‘ISTG’ stands for “I Swear To God” and is commonly used in text messages and online chat. The expression “I swear to God” is used for centuries and originates directly from the Old English word “swear” which means swearing. ISTG is an acronym that means I swear to God. ISTG Meaning= Threat3. What does LFG ð mean? LFG as “let’s freaking go” has since become widespread in texts among friends as a way to excite or “hype up” one another about a particular event or situation. When used in text conversations, ISTG retains its original meaning of “I swear to God. What does 'ISTG' mean? "ISTG" stands for "I swear to God," an acronym usually used to express the seriousness of a situation or assure you're not joking when sharing a surprising fact. Since this is a very casual acronym, avoid using it in. ISTG stands for I Swear To God. "I swear to God" isn't just texting slang – it's used in everyday conversations to emphasize the truth at hand. What Does ISTG Mean? In internet chatting and text messaging, the acronym “istg” actually means the phrase “I swear to God. In summary, ISTG is an acronym widely used in informal online communication. ’. ”. Essentially, ISTG is a shortcut way of saying "I. ISTG stands for “I swear to God” and is often used on Snapchat to emphasize a point or express strong emotion. It's a close relative of the OMG (Oh My God). The ISTG definition includes a short acronym for a phrase that reads as ‘I Swear To God’. ISTFG, I can’t believe she actually said that to me. Clear Of Patient Diagnosis B. 2. FOMO meaning: the fear of missing out. Avoid using this abbreviation in business or professional settings because it is so casual. ILYSM means "I Love You So Much. What does 'ISTG' mean? "ISTG" stands for "I swear to God," an acronym usually used to express the seriousness of a situation or assure you're not joking when sharing a surprising fact. Likewise, if you have ever seen the text code "ISTG" in texting and wondered what does ISTG mean in text. Alternatively, you might say ISTG to show exasperation or frustration at something someone is telling you. ISTG can be used to express extreme seriousness, anger, or surprise, and is usually used outside of serious religious contexts. I swear to fucking god. This is also very similar to. ISTG is simply an acronym that means I swear to God. ISTG Meaning What Does “ISTG” Stand For? If you’ve ever seen “ISTG” in a text message or on social media, you might be wondering what it means. It’s similar to the term ‘ONG. FYP means For You Page. Its meaning is “I Swear To God,” and it is commonly used to add sincerity or emphasis to a statement. Expand Your Lexicon: Discover 5+ Similar Words for ISTFG When it comes to texting, understanding similar. It could be used to define the frustration or annoyance you might have towards something or somebody. suggest new definition. One of the known acronyms is “ISTG” or “istg”. Page ContentsWhat Is ISTG Meaning1. It could be used to show how excited they are or to express. ”. It can be written in both lowercase “istg” and capital “ISTG” letters. While the presence of the word “God” might indicate some religious connotation, it’s not a religious term at all. This is a common acronym that is used online, typically in text-based communication. This is a group of teachers that are more than friends. It can be used to convey sincerity, make promises, express annoyance, and more. It can be used to convey extreme seriousness, exasperation, or surprise, and is usually used outside of a serious religious context. ETA meaning: estimated time of arrival. For example, if someone decides to message you with insulting comments about your hair, then you might reply with "STFU. While some text codes (like brb, lol, and omg) are simple ones that parents can understand, it can be difficult for parents to understand many codes teenagers use nowadays. The term comes from “shipping” within fandom culture. This phrase is typically employed to express surprise, disbelief or concern over a given situation. ”. new search. Annoyance and Assurance Another ISTG How to Use ISTG One of the hottest internet acronyms among today's teenagers is ISTG. It can often. Usually used after saying something ‘cool’. Even though the phrase includes “God,” its meaning and uses aren’t considered religious. TLDR meaning: too long; didn't read. This is a casual phrase that many people use both online and in real life (imagine someone exclaiming “I swear to God!” when they’re frustrated or emphasizing a point). So, if you ever heard OMG (O My God), another popular acronym, ISTG won’t surprise you anymore. ISTG=Make a PromiseWhat Is ISTG Meaning in SlangIstg Slang Usage (Examples and Use Cases)ISTG Meaning on TikTokISTG Meaning SnapchatFAQs on ISTG Meaning1. " ISTG is used to add emphasis to a statement (usually a promise, threat, excuse or apology), or as an interjection which expresses surprise, skepticism or exasperation (similar to OMG ("Oh My God!") ). ETA meaning: estimated time of arrival. ”. ISTG is an acronym that is short for “I swear to God”. HMU meaning: hit me up. This. Promise. What Does Istg Mean In Text? I swear to God ISTG means “I swear to God. ”. The abbreviation ISTG is widely used in text messaging and online chat with the meaning "I Swear To God. It is commonly employed in informal chats, videos, and posts to show seriousness and truthfulness. It is a stronger version of the phrase “I swear”. I Swear to God. Use ISTG to show you’re not joking about something, or to express annoyance or frustration with something (or someone). Also, Check What Does SNM Mean In Texting? What Does ISTG Mean and How Is It Used in Real Context? The use of shortened phrases is a popular way to communicate in text messages and online conversations. It is used to emphasize a statement, a promise, or a claim, to express frustration, or to make a solemn vow. What does 'ISTG' mean? "ISTG" stands for "I swear to God," an acronym usually used to express the seriousness of a situation or assure you're not joking when sharing a surprising fact. ILYSM can be used to express profound affection. Istfg Meaning Is: Istfg stands for “I Swear to Fucking God. U Jelly has become a very popular expression, and because of its viral spreading nature, it has achieved meme status. It’s an acronym that people use to express the seriousness of a situation or to emphasize that they are not joking. What Does ISTG Mean in Texts or on Social Media? ISTG means “I swear to God” in text messages and on social media platforms like TikTok, Snapchat, Twitter, Instagram, and more. " People use it in various places on the internet to tell someone to stop talking or as a gut reaction to something offensive or mean-spirited. A very dramatic phrase to be used only in exceptional circumstances. The phrase was later. ATP meaning: answer the phone. Here’s what this multifaceted slang term means and how you may. ISTG Meaning= ThreatUse Cases & Examples. This phrase can be used to swear truthfully without having to use a more serious swear word, such as the word "God". ” Origin of ISTG. Meaning. -ISTG that was the best pizza ever! -I put your racket back in your duffle bag istg. ISTG meaning is “I Swear To God” and is one of the most widely used acronyms in the English language. What does ISTG mean in the text? Ans. ISTG. Start the day smarter. Today, I'll walk you through what ISTG means in text and other text. What Does “ISTG” Stand For? “ISTG” is an acronym that stands for “I Swear to God. Overall, the acronym STG stands for “swear to God. "I swear to. STG: You can swear to god when you are frustrated or in exacerbation. Pinky promise. The texting term ISTG, which means "I Swear To God," tells people that you really do mean what you're saying. . Definition of ISTG in Slang/Internet Slang. A. It can also be used as an expression of sincerity, such as when a user is making a promise or expressing their. 查看翻译. What Does “ISTG” Stand For? “ISTG” is an acronym that stands for “I Swear to God. This acronym often highlights the sincerity, seriousness, or exasperation of the person using it. ” How to understand Texting Abbreviations!! LOL and LMAO, SMH, FFS… and all the other ISTG Meaning A short video summarzing the most common. ISTG Meaning= Honesty or Certainty2. So, if you ever heard OMG (O My God), another popular acronym, ISTG won’t surprise you anymore. 1 definitions of ISTG. ISTFG. ” Origin of ISTG. ISTG is a slang abbreviation used in online messaging and texting that means 'I swear to God. I Swear to God. Like, "ISTG, if I get one more. What Does ISTG Mean? ISTG is an acronym that stands for “I Swear to God”. What does STG mean?U Jelly is often used to goad someone online or in-person because you possess an article that they do not have, or because you have attained some kind of gamer achievement or minor online fame. It is used to express frustration, anger, or disbelief. I’m beyond shocked. Usage: “Oh nice, you finally finished it! Welcome to the club B)” What does BB mean?What Does ISTG Mean in Texts or on Social Media? ISTG means “I swear to God” in text messages and on social media platforms like TikTok, Snapchat, Twitter, Instagram, and more. ABC – This doesn’t stand for anything. By swearing to God, you make a sacred oath that most people respect more and therefore, are more. The term is primarily used to emphasize a point you’re making and can reiterate anger or annoyance. Going deeper into its meaning, ISTG sounds quite similar to OMG ‘Oh My God!’. While it may seem like a phrase that you would use in casual conversation, it can be so much more than that. Abbreviation of I Swear To Mother Fucking God. This initialism should be avoided in professional situations or in conversing with someone who is religious. ISTG is an acronym used in texting, which stands for “I swear to God. IMO meaning: in my opinion. new search. In conclusion, “ISTG” is an acronym that stands for “I swear to God. Today, I'll walk you through what ISTG means in text. "I swear to. ”. Chronic Osteomyelitis Pathology Degree Embed Share an image of ISTFG » Click to view: Hearing impaired tip:. Here's what "ISTG" means and how you can use it in your next text exchange. The”I” is the person who is saying it, while”F” is an expletive “F” can be an exclamation point added to the expression. Throughout the years, a variety of terms have arisen which make it easier to communicate online. What does 'ISTG' mean? "ISTG" stands for "I swear to God," an acronym usually used to express the seriousness of a situation or assure you're not joking when sharing a surprising fact. “ISTG” stands for “I swear to God,” and it’s commonly used in texting to express the seriousness of a situation or to assure someone that you’re not joking when. 2. " “ISTG” meaning over text message. It represents an empathetic or mildly shocked response to unexpected news or events. In summary, ISTG is an acronym widely used in informal online communication. The slang abbreviation ISTG is frequently used as an interjection to express emotion or as an attestation of honesty. ISTG is often used in informal conversations, texting, and on social media platforms. Complaint Of Patient Data C. ISTG is simply an acronym that means I swear to God. This phrase is often used to express frustration or exasperation with a situation or to emphasize the sincerity of a statement. It’s a direct and sometimes blunt way of communicating that the information just shared doesn’t impress, affect, or matter to the person asking “so what. ISTFG means “I Swear To Fing God,” a phrase used to emphasize sincerity or seriousness when making a statement. What does Istg mean in text message . For example, three sample text messages using the abbreviation ISTFG could be: 1. When someone uses ISTG, they are essentially emphasizing. It may sound like a new term to some, but this one is very familiar to social media users. ” Definition: Istfg is an acronym for “I swear to f Up. Summary: · The added I at the beginning just refers to the person that is saying this, so ISTG means “I Swear To God”. It can be used to express emotions, surprise, or sudden kind of feelings. It comes from the courtroom oath that traditionally said, “i swear by almighty god that the evidence i shall give shall be the truth, the whole truth, and nothing but the truth. What Does ISTG Mean In Texting? Snapchat represents a real-time multimedia communication platform that takes a step beyond traditional messaging applications. More violent then just I Swear To God Learn what ISTG means in this quick and easy guide! Find out what the abbreviation stands for and how to use it in real life with this simple explanation. This can be seen in phrases like: “ISTG, I’m always here for you” or “ISTG, I’ll never forget what you did for me”. OFC meaning: of course. You can use it to show your deep frustration, attest to the truth of something, or underline your beliefs. However, as with many other abbreviations meaning "I love you," it should not. – What does istg Mean in Text – ISTG is a popular online abbreviation among today’s youth. I swear to f**king god (ISTFG) is an abbreviation used to express exasperation, disbelief, or agreement. Confused about slang like cap, HB, ATP, and more? We defined some popular TikTok acronyms for you. -ISTG that was the best pizza ever! -I put your racket back in your duffle bag istg. ISTG can be used in various contexts and can have different implications depending on the conversation. In a different context, “sw” can also mean “someone who. I swear to fucking god. ”. The “baby” part of the phrase isn’t a literal reference to a child, and. They prefer to work in traditional organisational environments, with people who take their. Prison gang. Do you know what ISTG means in a text message? Watch this video to find out when to use ISTG in a text message and what it means!What Does “ISTG” Stand For? “ISTG” is an acronym that stands for “I Swear to God. ISTG is an acronym that stands for “I Swear To God”. In contrast to standard text or audio messaging apps, Snapchat offers the unique ability to share fleeting live video messages that vanish as soon as they are. ISTFG. The media could not be loaded, either because the server or network failed or because the format is not supported. "I swear to. 4. Gunna explained that the ‘P’ stands for ‘player,’ although it can also stand for. '. What does GM mean in text from a guy?What does df mean in texting? In the realm of texting and digital messaging, “df” usually stands for “da fuq”, a slang and casual form of saying “the fuck”. TLDR meaning: too long; didn't read. ISTG Unveiled: Introduction to the Slang. What does 'ISTG' mean? "ISTG" stands for "I swear to God," an acronym usually used to express the seriousness of a situation or assure you're not joking when sharing a surprising fact. Person1: I'm so exhausted. It is commonly used in text messaging to express the seriousness of a situation or to assure that a statement is not a joke. IYKYK meaning: if you know, you know. The slang abbreviation ISTG is frequently used as an interjection to express emotion or as an attestation of honesty. 1 definitions of ISTG. ISTG Meaning. The acronym ISTG is commonly used in text. What does OTP mean in texting? “OTP” means “one true pair/pairing,” according to Merriam-Webster. STFG stands for Super Teacher Friends Group. "Meaning; ISTG: I Swear to God: ISTG: Immigrant Ships Transcribers Guild: ISTG: Information Storage Technology Group (University of Twente; Netherlands) ISTG: Inter-Site Topology Generator: ISTG: Implicit State Transition Graph: ISTG: Integrated Systems Tech Group (Tampa, FL) ISTG: Innovative Science and Technology Group (est. Whenever a TikTok user opens their app, they are directed to their For You Page, which is a stream of videos that TikTok thinks that user will like. Further Reading: What Does NFS Mean: Here Is All-inclusive Information You Need to Know. “I swear to God” is a common phrase that people use to show that they are telling the truth or to express their sincerity. So, the next time you see someone using “istg” in a message or post, you’ll know exactly what they mean. Matching search results: Since the STG meaning is often expressed fully when in a verbal conversation, the term STG should only be used in casual conversations via text or on. ISTG and OMG can also be used interchangeably often. Jamie Grill / Getty. ISTG Meaning= Threat Use Cases & Examples. You will find information about the origin and other possible meanings in all types of information on this acronym, including its. ISTG is an acronym used for “I Swear To God. ISTG stands for: I Swear To God. The”I” is the person who is saying it, while”F” is an expletive “F” can be an exclamation point added to the expression. showing only Slang/Internet Slang definitions ( show all 7 definitions) Note: We have 1 other definition for ISTG in our Acronym Attic. ”. It can be used to express emotions, surprise, or sudden kind of feelings. This is also very similar to. Origin of ISTG. This expression is most likely something you've heard in ordinary conversation. What does istg mean in text. ISTG is an internet slang initialism that conveys earnestness, annoyance, or surprise. ONB is an abbreviation commonly used in texting, which stands for “Oh No Baby”. Simply put, “ISTG” stands for “ I swear to God . OFC meaning: of course. Having a parental control app on your child’s phone will give you. It's not typically used in a religious context. Social media platforms: Snapchat, Instagram, Twitter, TikTok, and more. This expression is used to emphasize the truthfulness or seriousness of a statement. Similar to “I Swear To Fucking God” istfg, in that it is an escalation of the original term “I Swear To God” istg. This initialism should be avoided in professional situations or in conversing with someone who is religious. What does ISTG mean? ISTG means “I Swear To God”. STG means different things to different people but its most common meaning is ‘Swear To God’. 2006)Texting with friends is the best way to use this term. It is used to emphasize a statement, a promise, or a claim, to express frustration, or to make a solemn vow. Here's what this versatile slang term means and how you can use it in your messages and social media posts. It’s also like STG. It is commonly. ”. How Is ISTG Used? Use Cases & Examples. ISTG is an abbreviation commonly used in text messaging and online communication, particularly among younger generations. B) used to be the symbol of a person wearing sunglasses with a smile on his face. You might learn your child is using this slang term by chance when a text pops up on the phone screen. Specifically, as internet usage is increasing daily, people. It’s also like STG. Get all the news you need in your inbox each morning. What does B) mean? Back when emojis weren’t a thing, ‘emoticons’ were used to add more emotions to the text. Read Also: What does CFS mean on Instagram? Common Uses for ISTG . HMU meaning: hit. "ISTG" stands for "I swear to God," an acronym usually used to express the seriousness of a situation or assure you're. Specifically, as internet usage is increasing daily,. It stands for “I swear to God. It's used express emotional sincerity or to seem intimidating. Usually, students or the young generation use this acronym. ISTG. Meaning. Chronic Obstructive Pulmonary Disease D. For example, they might say “ISTG this homework sucks. Get all the news you need in your inbox each morning. This phrase is used to emphasize the truth of a statement or assertion. Likewise, if you have ever seen the text code "ISTG" in texting and wondered what does ISTG mean in text. ” This abbreviation is commonly used in informal conversations on various digital. Its meaning is “I Swear To God,” and it is commonly used to add sincerity or emphasis to a statement. It is an acronym used to emphasize a belief in or commitment to the truth of a statement. ISTG means I swear to God. showing only Slang/Internet Slang definitions ( show all 7 definitions) Note: We have 1 other definition for ISTG in our Acronym Attic. It can also be an expression of surprise or. It is often used in informal conversations, especially when expressing frustration or disbelief. GTFO can be used to express disbelief or displeasure. -ISTG that was the best pizza ever! -I put your racket back in your duffle bag istg. Looking for online definition of ISTG or what ISTG stands for? ISTG is listed in the World's most authoritative dictionary of abbreviations and acronyms ISTG - What does ISTG stand for?Definition of the term. While some text codes (like brb, lol, and omg) are simple ones that parents can understand, it can be difficult for parents to understand many codes teenagers use nowadays.