YOU WON'T! 

The act of saying the phrase "YOU WON'T!" after someone announces they're going to do something. Generally used to be funny, and/or taunt the individual.

I'm gonna beat yo ass bro.
"YOU WON'T!"

YOU WON'T! by Nana. September 10, 2011

You won't! 

I phrase used by Jake Paul and Team 10. Only dumb people say this phrase.

Box my dad, you won't!

You won't! by Alpha Cue August 14, 2018

You won't

An expression used to challenge a person to commit an action.

Appropriate responses are as follows:
In agreement to do the action = "Who Won't?"
Not in agreement to do the action = "You right"
Absolutely not in agreement to do the action = "Are you dumb?"
To counter challenge = "YOU won't!"
When used in an overly serious manor "you won't" may be interchangeable with "You will not!"
Warning: Increased use of alcohol can and will cause excessive repetition.

Person 1: "You won't do jam and night." Person 2: "Who won't?! YOU won't!"

You won't by R U Dumb February 4, 2010

you won’t 

As in “you won’t do it”. Trying to get the person to do whatever. Almost like a dare

Joe “should I get that girls number”
Ty “you won’t”

you won’t by Hips11 November 13, 2017

You Won't

Whenever someone says they'll do something, someone else comes back with "You won't!" It's almost like a dare. If the person does said thing, the "You won't"-er usually comes back with something like "OK, so maybe you will."
Commonly used by the surf-bum kids who pioneered such gems of slang like "Dude" and "Sweet".

Person1: Man, every time my math teacher gives me homework, I want to pull a Columbine on her!

Person2: You won't!

(Person1 does. Person2 is arrested as an accessory.)

~OR~

Chemistry Teacher: Now, Hydrogen gas explodes very easily. I could show you a demonstration, but I don't have time.

Pyromaniac Class: You won't! You won't!

Chemistry Teacher: Well, I GUESS we could squeeze it in...

Class: Yay!!!

You Won't by JillieManicotti February 18, 2004

You won’t 

Used to date someone into doing something using reverse psychology. If someone says you won’t; you, by law of Jahseh, have to commit the action.

Friend: Hey Joe, shove Yura off the cliff

Joe: Noo, I can’t!

Yura: You won’t

*Joe shoves Yura off of the cliff*

You won’t by rushman20 October 28, 2019

You won't

Inverse psychology that works with many but not with everyone.

You won't... pff this one is tricky...

Just call me... I won't do it
Clear?

You won't by Ayuryari November 25, 2021