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!

I will fuck you up! by noladoc April 26, 2014

Why? FUCK YOU, that's why. 

What someone says when they have done something for the purpose of maliciously disrupting another person(s) motive, intentions, life, job, etc, and the victim asks that someone why they did it.

NEWS AGENCY: We have hired a new science editor.

Bob: Welcome to the team, Freeman. We need you to start by editing this paper on climate change. Exxon is one of our top sponsors and they have told you to remove the bit on 80% efficiency solar panels and make it look like oil does not harm the environment.

Freeman: Ok.

3 days later:

Bob: FREEMAN! You included the bit on 80% efficiency solar panels, you made the bit on oil seem even more against the environment, and then you proved that Exxon bribes us! WHY?!

Freeman: Why? FUCK YOU, that's why.

Why? FUCK YOU, that's why. by The Lion's Word July 20, 2011

I will fuck you with a rake

An exclamation of affection, usually directed at a loved one, that expresses one's desire to forcefully insert a rake into another's sex organs.

"Roses are red,
Violets are blue,
I WILL FUCK YOU WITH A RAKE"

I will fuck you with a rake by Muhammad Hassan October 1, 2008

National fuck you Kai day 

January 7 is the national day for everyone to express their hatred for any known Kai.

“Gababa”
“Fuck you Kai, it’s National fuck you Kai day.”

National fuck you Kai day by Nintenfrogs October 17, 2022

i wont not fuck you the fuck up

It’s a statement that you can say when people attack you for no reason and you want to take action but you don’t know how to exactly do. It’s been used from Lana Del Rey on Twitter when she was attacked by Azealia Banks for Kanye West stuff.

“You’re a fat bitch”
“Say it to my face bitch. I wont not fuck you the fuck up”

i wont not fuck you the fuck up by Mirinat October 14, 2018

The "Fuck You" Button 

The "reject call" option button on a cell phone, usually reffering to the red "Disconnect/End-Call" button, used to reject unwanted incoming calls.

"I've been getting the "Fuck You" Button from her all day long. I should stop calling."

The "Fuck You" Button by YTal September 25, 2005

son of a fuck you 

Uttered in only the most painful of situations. Most likely stated while the brain is trying to grasp what the fuck just happened to you.

Random Bystander:(gets hit in the face with a baseball traveling 200 miles per hour) THWAK! OUCH! SON OF A FUCK YOU! What the fuck just happened to me? Was I hit by a baseball or just received a roundhouse kick from Chuck Norris?!

son of a fuck you by Nirvana rapes you February 8, 2008