"I'm writing a story in which I become a bro. When you read that, what did you think? If everyone could send me a sentence or two on what the hell they think a bro is, that would help me out quite a bit."
If you're saying to yourself, "Wow, he's trying to get his coworkers to write this story for him," you're right! My coworkers range widely in age and background and relative bro-ness. Here's what they sent me.
"A bro was probably in a frat, plays lots of fantasy sports, hits the gym hard, drinks mad buckets of sweet domestics and plenty of Red Bull."
"... a dude in a polo and khaki shorts wearing SOME kind of sports gear who drinks lite beer, gets into fights, catcalls women, and loves Entourage more than his mom."