fthu 

For the heads up

Rarely used in games especially mmo's

Person 1: Is it hard to lvl priest :O?

Person 2: Ya its fucking hard fthu.

Person 3: kthnxbai

fthu by jaliz October 20, 2008

FTHU 

A lazy word for Fuck the hell up

WhatsApp:
Lyan: You are dating with Shelia aren't you Max?
Max:FTHU b*tch!!

FTHU by not your daily white girl November 10, 2017