Obnoxious partying males who are often seen at college parties. When they aren’t making an ass of themselves they usually just stand around holding a red plastic cup waiting for something exciting to happen so they can scream something that demonstrates how much they enjoy partying. Nearly everyone in a fraternity is a bro but there are also many bros who are not in a fraternity. They often wear a rugby shirt and a baseball cap. It is not uncommon for them to have spiked hair with frosted tips.

Bros actually chose this name for themselves as they often refer to each other as "bro" even though they are not related.
I couldn't go to sleep last night because some bros at the party next door kept screaming, "Whoooooo!!! YEAAHHHHH! Whooooooo!"
by J Will May 8, 2005
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NOT THE DEFINITION FOR DOUCHEBAGS.
Your bro is your homie(s) for life. Calling someone your bro declares automatically that you are down for life, that your bros come directly in front of thy hoes. Choose carefully who you declare as your bro, because some people could intercept this very wrongly and it could backfire. You could call strangers you interact with "man" and/or "dude" but "bro" is sacred.
Whats up bro? (to longtime friend/friend who has your back and vice versa)
by iceb3rg August 19, 2009
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Verb: The act of one bro hanging with another bro or bros.
"Hey man, what are you doing today?"
"Nothing man, just broing with some of my bros."
by MattBallea December 24, 2011
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Short for "brother". A way of addressing virtually anybody. Used much the same way as "bud", "buddy", "dude", or "man". Originally pronounced "bruh", nowadays it usually rhymes with "snow".
Sing a song, bro. (Jimi Hendrix, from "If 6 Was 9")
by Bro Dudely September 26, 2005
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close friends; buds; pals; comradarie
hey, he's my bro, I watch his back, and he watches mine, we're like brothers, yah know?
by Ilianivich March 15, 2003
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"The Three Types of Bros"

SMART BROS can turn the broness on and off when they have to. they are not truly dedicated but parts of them resemble a bro. if they had to they could get rid of the bro accent and swagger and be a normal guy.

AVERAGE BROS are not stupid but majority of the time they are true bros. they go to the gym and talk stats about games all the time they have tattoos of crosses but not hardcore ones. they can get rid of the broness if they really want to but they normally dont cause they dont want to be embarrassed in front of their friends.

and then there are the HARD CORE BROS / HELMET BROS . always match their clothes. have dip in their mouth all the time. constantly talking about drinking, sports, or working out. at the gym check themselves out in the mirror more then a girl. actually they check themselves out in any shiny surface. have many large cross tats with a shamrock or a sports team on it . protein shakes are always with them they yell and make constipation noises when they lift weights, they yell when they are done, and always slap each others asses. They are so stupid they need helmets
Person1: Now around the fraternity part of the college you are going to find that there are alot of...

Bro: AHHHHHHH YEAAAAA MAN THATS WHAT IM TALKING ABOUT BRO UHHHHHHHHH GIVE ME MORE OF THAT MUSCLE MILK MAN WOOOOO YEAAAAA

Person 1: bros
by liljohnmac2269 November 26, 2009
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