1. Male friends who are close enough to talk about their feelings, without feeling gay.
2. Men who act like there are no women around, even when there are. They often wear polo shirts and curse loudly, along with excessive use of the word "bro". These types of guys originated the term, "bro".
Bitchy Girlfriend: "Where are you? When are you coming home? You're at the bar, aren't you!?!?!?"
Dude: "I'm out with the bros babe. Call you back." *hangs up* "So wassup guys are we gonna go to the bar or what?"