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 facelike no other. Guess what I did"
Guy 2: "What?"
Guy 1: "I licked 'em!"
The Famous Words Of Homer Simpson. Also refers to a drunken man or woman who has hurt their Frontal lobe section. Or stuck a crayon up their nose and hit their brain.
"Dope! I think I brained my damage" "Hunny, My damage is brain"