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To strike or assault someone violently and severely, typically on the head. He warned me that he was going to brain me if I didn't stop insulting him. The lump on my head is from when a box fell off a shelf and brained me yesterday.
See also: brain
Particularly stupid, foolish, or narrow-minded. The town hall meeting was hijacked by a few pea-brained morons trying to protest the new highway development. Don't let Tom's comments get you down—he's just a pea-brained jerk who puts other people down to make himself feel smart.
1. mod. stupid; mindless. (Taboo. Usually objectionable.) What a stupid, fuck-brained idea!
2. mod. obsessed with sex. (Taboo. Usually objectionable.) All he thinks about is dames. He is totally fuck-brained.