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1. 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!"
2. 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!!!
by JillieManicotti Feb 18, 2004 add a video
3. you won't
expression used by people, often while playing sports in gym or practicing for their band; challenge of skill;
Guy about to shoot a basketball: I'm gonna make it in!
Other Guy: You won't!
Guy: Say I won't
Other Guy: You won't LOSER
Guy shoots and makes it in
Guy: OH! OH! who da man?
by Kay Mar 21, 2004 add a video
4. you won't
a prefix to any request of an individual which may affect his gangster if not carried out.
"You won't go to 7-11 and buy a dutch."
"You won't ask that motorist if they have any Grey Poupon."
"You won't drive to Philly at 5am for a cheesesteak."
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