folding your ring, middle, and index fingers and having your thumb and pinky up. it is similar to the Y in sign language. having done this shake your hand like the blades of a helicopter.
I sawtwo of my best bros and threw up the brocopter.
A man with a below average penis length, that when inebriated exposes his genitals to a large crowd of people whilst spinning his penis counter clockwise like that of a helicopter.
Bro, i was at this party last night and this guy totally started doing the brimcopter in the middle of beerpong.
Sex position where you dress up like Batman with no pants, dick and balls out, hanging from a ceiling fan while you sing NANANANANANA BATMAN while your partner attempts to grab it with her/his mouth mid air.
Dude Shae is such a hoe. BatCopter'd her while her parents were still home.