ISTFG 

I swear to fucking god. More violent then just I Swear To God

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Reply: ISTFG if you don't stfu.

ISTFG by a.Ayala December 25, 2010

istfg 

i swear to fucking god

Istfg that girl is annoying

istfg by chickennuggets59 February 20, 2018

istf

i swear to fuck
i personally use this a lot bc i don’t believe in god it’s a substitute for istg

bro istf if my downstairs neighbors don’t stfu in t minus 2 seconds imma kms

istf by gh0st_bxnny25 July 2, 2021

istg 

I Swear to God. Promising

She asked him out, istg!!!

istg by Dank Frank January 3, 2008

istg 

I swear to God~ it is a way of express you're being honest about something or expressing extreme annoyance at someone.

Friend~Your such a liar you dad didn't buy you a Lamborghini.
Me~He did, istg!

Friend~Ha Ha my parents are richer than you
Me~istg you so annoying ;-;

istg by XxZoexX July 27, 2020

Istg 

Istg is short for I swear to god

Istg, Hoseok is a ray of sunshine

Istg by Weird.flex.but.okay. February 18, 2019

istg 

I swear to god.

Jim : I ate your leftovers in the fridge 😛
Chloe: Istg if you did ill kill you!

istg by barbz 😍😛😋 February 1, 2021