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1.
Used when you like something, or are 'down' to participate in a certain activity. The phrase can also be used as a filler when no logical explanation can be attained.
Bennett: Dude, are you down for some Taco Bell?
Bryce: I'm 'bout it.

Officer: Sir, you realize you are in possession of twenty-two types of illicit drugs?
Guy:...I'm 'bout it.

Me: IM SO 'BOUT SOME PIZZA RIGHT NOW
by thugstalicious September 27, 2009