Top Definition
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!
door ,fknkd 25 april 2010

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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.
door pinkdaisy4 9 februari 2009

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often said when someone does or says something stereotypically Maori, such as stealing or going to KFC.
you know why... its because your Maori.
Nathan: bro i got me a mean feed at kfc last night
Josh: you know why...
door hahahhahahahahahahahahahahhaha 18 juli 2010

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