Popular song quote from the song "What U' Doin" by Big Sean; meaning "what are you doing?".
hey what are you doing?

chillin with a niggas nigga, and a couple cool bitchez. fuck you doin'? bullshittin
by Hatnin_5 August 2, 2010
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A question asked when you are wondering what the fuck someone is doing.
Fuck are you doin dude
by Shitkickerxxx69 August 28, 2011
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