Top Definition
Someone who is crazy, or acting crazily.
"Look how recklessly that man is driving. (he is a) madbrain"
by bananamilkshakefiend October 15, 2009
1 more definition
5 Words related to madbrain
Mad Brains is a synonym for the incidence of receiving a very good blow job.
Man, that girl gave me mad brains last night.
by pba24899 February 20, 2010

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