Brostitute

Brostitute: Acting as a "bro" at any time or at any request. This is the most loyal form of being a bro.

Guy1: Hey bro, can you pick up some chocolate for me? I wanna impress a chick.
Guy2: It's almost midnight, but..sure bro, what kind?
Guy1: That double-sized box at that other walmart like 15 miles away.
Guy2: Dang, that's a bit away, but don't worry..I got this.

Guy2 is an example of a brostitute.