Top Definition
It's what your freinds tell you when you aren't ready to go or do something.
Nick: We out to lunch
Paul: I don't know...
Nick: You Ain't Down!
by You Ain't Down December 05, 2008

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when someone tells you this, they are trying to say that you can't do something cuz you're not brave. so you have to reply "i'm down", and then do it
guy 1: hey, are you down to go steal that car
guy 2: you aint down
guy 1: i'm down.....just watch
by El Coyote July 10, 2008

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One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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