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1.
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 saw two of my best bros and threw up the brocopter.
by tre-1 October 19, 2010
 
2.
When one extends the thumb and pinky in the bro hand formation. Does a helicopter motion and gives a high five.
A: Just got some mad dome!
B: BRO COPTER!
by BroCopter inventor November 01, 2011