VERB: To have someone else's hairy balls shoved in your face unexpectedly. When they are shoved in your face, the balls and tightly gripped to resemble the look of a human brain. Penis should be hidden in the process so that the balls are the only thing that are shown.
Guy 1: "Dude, i just got brained in the face like no other. Guess what I did"
Guy 2: "What?"
Guy 1: "I licked 'em!"
Verb. To be hit really hard in the head.
I got seriously brained against a brick wall and I still can't see straight.