ISTG | What Does ISTG Mean?
The abbreviation ISTG is widely used in text messaging and online chat with the meaning "I Swear To God." 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!")). For example: Chris: I am going to tell Jon that it was you who sent him the card. Sam: ISTG I will …
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