I will fuck you up!

means the person saying it plans to seriously injure or kill the person it is said too

Tom: Hey, dude, you want to fight? Hit me!
Bill: Man, You should walk away! I have a black belt in karate. I will fuck you up!

by noladoc April 26, 2014

i just fucked you up

I literally just engaged in sexual intercourse with you, but it was over so soon, you didn't enjoy it. Sorry.

Sorry, I just fucked you up. I'll do better next time. I promise.

by SadPancakes May 17, 2015

i know you fucked up

I know you fucked up

I know you fucked up

by Lala len February 9, 2021