Top Definition
A brain genius is what you get when you cross a rocket scientist and a brain surgeon. Can be used sarcastically, or as an actual compliment.
Guy 1: We should jump off the roof!

Guy 2: Yeah... great idea brain genius.

Guy 1: No, we don't have to buy a new one, we can just duct tape it.

Guy 2: I didn't even think of that! You're a brain genius!
by AGun June 17, 2010

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