This is what you say after you punch and/or kick a guy in the balls. This is a good revenge to use on douchebags. Here's what you do:

Knock on douchebag's door.

When douchebag answers, come at him like a spider monkey- a deranged, rabid spider monkey.

Punch/kick him right in the nuts.

As he writhes on the floor and cries, "Whhhhyyyy??!?!?!", You point at him and yell very scarily, "YOU KNOW WHY!!"

And he will know why.

Revenge accomplished!
How to correctly carry out a "you know why."

Dave (answers door): Oh, hi..
(Sara, crazy eyes and all, punches Dave in the nutsack)
Dave (falling to the floor): WWWWWHYY?
Sara: YOU KNOW WHY!
by ,fknkd April 25, 2010
Get the you know why. mug.
you know what is going to happen next...

you are able to reach a conclusion about what comes next
he decided to kill K... and you know the drill
by Ihering from Argentina June 29, 2009
Get the you know the drill mug.
An exaggerated statement usually following a junk punch; including a gesture of an angry pointing of the finger and an evil eye.
*Knock on door*
*Douchebag answers*
DB: ..You!
*Junk puncher punches junk*
DB falls to his knees: WHY?!
JP: You know why.
by pinkdaisy4 February 10, 2009
Get the You know why. mug.
A word standing for an exclamation, or a response to something that you like. Usually said with emphasis on the word "you". (Can also be spelt 'Yuno')

The use of this word originated in the small North Carolina town of Garner.
1. "Did you see that new Chappelles show last night?"
"YOU know!"
2. "Yes, I just got an A on this test! YOU know!"
by piper April 16, 2004
Get the You Know (Yuno) mug.
A song by T.I.

When someone recognizes, acknowledges and agrees with a statement somebody has made.
Guy 1: That was a sick touchdown.

Guy 2: You know what it is.
by BigThingsPopping August 24, 2008
Get the You know what it is mug.
This was a phrase that has been thrown around and can fit in just about in any situation...but mainly serves to piss seby off, which it is extremely effective at.
PJ/Matt "Well...YOU KNOW"
Seby "Shut the fuck up"
PJ/Matt "Seby ... Well YOU KNOW"
Seby "You guys are gay"
by pj April 5, 2004
Get the Well...YOU KNOW! mug.
Larry: I am heading back home, I will be cool.

Harvey: Well, watch out for you know who as you walk through that neighborhood on your way home.
by cut the cards September 6, 2022
Get the you know who mug.