When explaining something, but it would make no sense to anyone else that hears it. So at the end of the story you add YOU DON'T EVEN KNOW.

Dane Cook's perfect representation of how it should be used. When in an arguement with your significant other this needs to be dropped at the end of the arguement when nothing else can be gained from the situation. Then one must promptly exit the room.

Catch phrase used by office personnel to show smug superiority to others.

Used to describe something that is out of the persons understanding. Is derived from Jamaican dancehall DJ's challenge to rival DJ's and call to audiences "ya don't know my style'' etc. Now used by townies and inner city kids to describe their experiences or views on life in general.

when someone is making fun of you about something that may not be true while others are laughing at you, you start crying and suddenly yell, SHUT UP, YOU DON'T EVEN KNOW!" and run away.

A catch-prashe/slang used by dumb kids who don't know how to express themselves any better.

The default response used by someone who is confronted with a truth about themselves that they would rather not face.

This phrase is commonly used by addicts, those with low self esteem and just about anyone else whose biggest fear is that someone else will notice their problem and offer to help.

Using this phrase successfully pushes away anyone wanting to help, and the user ironically ensures that indeed, nobody will ever know them.

In another ironic twist, if someone you know well says this phrase to you, then it means either:

1) they've been lying to you about who they really are (in which case it's their own fault that you don't know them), or

2) they have suddenly and fundamentally changed in the few seconds prior to telling you that you don't know them (in which case they also don't know themselves).

However, the case is usually that they're unobservant, self-absorbed, don't like that you were so easily able to identify their issues and resent the fact that they are unable to pay attention to anything long enough to 'know' it. They assume that everyone else is like this too, which is why they seem so shocked when uttering this phrase.

An ignorant question made into a statement by people from south of Texas who don't speak very good English.

What you say to prove you're black in front of millions of Americans.