The process where a male puls his testicle and dangles it just over the top of his trousers so it looks like a brain. then the mail raves around the room. also brains can be used to describe a testicle.
Wow me nd the lads were having a BrainDance round the room last nyt!
The sexual act of taking someone's eye out with a spoon, or any sort of instrument, and then having sex with the eye socket, until you ejaculate onto the brain.
"Did you check the doctor I recommended out?"
"Are you kidding? He looks like the kind that would give me a Surgical Brain Job as soon was I was asleep."