A guy who works out a lot, takes steroids to bulk up, attends the gym every chance he can get.
He will also blow every penny he can on pot (see marijuana) & beer. This type of guy likes to sleep with a lot of girls that he picks up at bars.
He can be seen among other Bro dudes, especially in bro dude brawls.
Person A: Hey want to go to the bars tonight?
Person B: Naw, tonights bar night, all the Bro dudes are downtown