ISF

Insomniac Shitposting Freethinker, a community of "immature atheists" and "wannabe freethinker" to start a religious flame war

ISF is a place for you to make a racist joke towards religious people

by Sir. B December 1, 2021

Isfs

shorter for I speak fluent sarcasm

-duh! it was sarcasm!
-don't worry, i know, isfs

by Camonday January 27, 2017

Isfs

Im so fucking stupid

Me:Whats 100x2?

Friend: Are you Serious?
Me: Wait nevermind isfs

by Bootywhole69420 August 21, 2018

Isf

Internally sexually frustrated

Lack of sexual activity resulting in one feeling sexually needy.

My sex life has been dead, I’m so isf.

by Vansie September 13, 2022