Brainable is someone who's so smart/sexy/funny you'd like to do them -- at least metaphysically, anyway, 'cause frankly they're so awesome that it would seem weird to actually do them, like, you know like having sex with Santa or Abraham Lincoln or something.
Ex.) Carl Sagan is totally brainable.

See also, Tina Fey, Kristen Schaal, Jon Stewart.
by Harvey is My Homeboy November 16, 2010
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an adjective used to describe a girl who you would let suck your dick but nothing else.
i wouldn't fuck her with your dick... but she's brainable.
by skap-a-phobic August 12, 2006
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