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Usually used in texts, meaning " I swear to god "
Istg that teacher is so annoying :/
I was walking down the street this morning and istg i saw someone that looked exactly like you
Istg I would punch if i had the chance.
Istg I would be such a good mom.
ISTG is the short form of "I swear to God" Also means I promise.
ISTG that microorganism is not my boyfriend!!!
It stands for *I Swear To God*
Istg you're dumb for not knowing what "Istg" means.