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A proposal or agreement between two bros in the 'hood.
Bro 1: Dude, these bitches be crazy

Bro 2: Defs. But they're the only girls in this joint. Lets make a brobrosal. I get the hawt one this time and you can take my ride

Bro 1: Your ride is a piece of sh*t, but hellz yeah
by Go... pseudonym! March 17, 2011