usually a term used when your friend tells you this crazy story about what he did you automatcilly have to call him a maniac or psycopath and then you have to tell them "who let you out of the asylum!?"
Haro: so i was fuckin blown right now and then i didn't know who Tobar was

Andrew: Damn! foo you a maniac, Who let you out of the Asylum!?
by El Equis June 6, 2009
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Used to express astonishment when somebody says or does something completely out of character. The only possible explanation is that they've been replaced by an alien shape-shifter who looks exactly like them, but acts differently.

The phrase is a parody of the cliché found in old movies, when somebody returns home to find their lover gone and a stranger in their place.
Shanee: "I'm going to stay in tonight and study."
Ruthie: "Who are you, and what have you done with Shanee?"
by Yogi Bhajan February 9, 2011
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a statement used to show contempt at another's actions and request that they leave your vicinity.
Kelly: "Your shoes are like soooo last season."

Amy: "Who is you? Step from around me."
by Amy Frost May 17, 2008
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A sarcastic expression used when a person uses the word "we" when they should have actually Used the word "I." Or when a person says that "we don't" do something that at least one person is actually doing. This expression is used to totally catch the offender off guard, rendering them incapable of coming up with a response to the awkward comment.
Teacher: "We don't eat in here"
Jim: "Who's we, you and that Turd in your pocket?!?
Teacher: 0_o (What the fuck?)
by hare bear September 9, 2010
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when someone says something that you very obviously already know..emphesis on the "you"! Meant to be sarcasm, but not in an offensive way.
If my girl were to say to me "Johnny Depp is sexy." I'd say "Who You Tellin?!" I know this!
by Amanda Wambold December 29, 2007
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what you say when a baby rudely tries to get into a party they were not invited to.
*sees baby*

Who do you know here, Baby?”
by itsjustmeg April 2, 2019
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