GTBYFB 

This stands for "go to bed you fucking bitch", and can be used in text or spoken word. Commonly used on ex girlfriends

Noah:*on the phone* GTBYFB
Millie: what was that?
Noah: oh it means "Go to bed you fucking bitch"

GTBYFB by Dwarfykins February 20, 2021

GTHYFB 

Go To Hell You Fucking Bastard.
An acronym that people who don't want to get in trouble use to tell other people off.

Hey man! That little girl wrote GTHYFB on that bus window!

GTHYFB by CoopDogg January 22, 2008