Usually a cocky douche bag who wears polo shirts (especially popped-collar), and likes to walk around with a starbucks iced cappachino while wearing a Northface jacket. The person is a preppy bitch who thinks they're hot shit because they're rich spoiled little assbags. Commonly, bros are whipped bitches who buy girls shit in the hopes that this will get them some, but the girls are only using him for his free shit.
Jake: Look at that kid over there. What a bro. Lets kick his ass.
Matt: Ya, that kids a douchebag.