1. Friend; commonly used in greetings.

What’s up bro?
I vouch for Todd, we’ve been bros since way back.

2. An alpha male idiot. This is the derogatory sense of the word (common usage in the western US): white, 16-25 years old, inarticulate, belligerent, talks about nothing but chicks and beer, drives a jacked up truck that’s plastered with stickers, has rich dad that owns a dealership or construction business and constantly tells this to chicks at parties, is into extreme sports that might be fun to do but are uncool to claim (wakeboarding, dirt biking, lacrosse), identifies excessively with brand names, spends a female amount of money on clothes and obsesses over his appearance to a degree that is not socially acceptable for a heterosexual male. The female equivalent of the Bro is the Bro Hoe. Bro Hoes are Bro groupies that hang around bros, many of whom are actually quite hot and are thus spared the scorn that is heaped on Bros.
My sisters new boyfriend is an idiot; the dude is a total bro.
by Lt. Dungheap May 01, 2006

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Lot's of people think that the bird is the word, but actually the bro is the word.
Dan is my bro, hence Dan is the word.
That bro is a caBROn
by CaBROhnson October 12, 2010

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Found primarily in the northeast and deep south, a bro is typically a white male from a wealthy background who enjoys excessive drinking and partying, sports (especially lacrosse), and music (usually underground rap (wiz khalifa, oncue), alternative (kings of leon, DMB), and techno) Bro's dress differently depending upon the region they live in, but the main elements include polo ralph lauren, sperry's, and designer sunglasses (costa del mars, ray bans). Bro's use the college they attend or attended as status symbols and most Bro's post-college can be found in the financial business. Bro's are considered to be extremely success oriented and their aggressiveness in life tends to anger several other societal groups (see hipsters).
Bros can be found in the majority of the male characters in Wedding Crashers, anybody who plays lacrosse, or Stifler from American Pie.
by Frosty the Flow Man August 07, 2010

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Quarterback of the Pittsburgh Steelers, best quarterback around, man who originated the "RothlisBURGER" sandwich at Pepi's in Pittsburgh, also know as Big Ben and Berger....o yea, GO STEELERS
Joe: Yo man you see B-RO's game last night?
Mike: Hell yea, he lit it up!!
by BIG MIKE April 18, 2005

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A young man, typically white and middle-class, fettered by his narrow and insecure view of masculinity. This manifests in his conforming lifestyle to other bros, disinterest in intellectual matters (or anything beyond sex, sports, and parties), and sometimes aggressive and intolerant attitudes.
The party was full of bros so we left.
by merlinmerlin February 24, 2017

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Bro is the short form of the word 'brother'.
We all will party along with bro!
by by Renna March 30, 2016

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a status higher than best friend. A bro always has his bro's back. You can easily spot bro by finding a small group of males doing something stupid. Contrary to popular belief, a girl can also be a bro. They mainly live by a set of rules (or guidelines) commonly called the BRO CODE. Brah and Bruh are different pronunciations typically used by douches to refer to basically any other male and should not be used unless you want to sound ridiculously douchey. The bond between 2 bros is everlasting and very rarely breaks apart. Many times, the bros will assist each other when hitting on chicks and a good bro will always jump on the "grenade" when his bro is hitting on a chick with an ugly friend in order to attempt to ensure that his friend will receive the best outcome possible. Unfortunately many young males misuse this sacred title reducing it to nothing but an obnoxious phrase a guy calls everyone in his frat.
Douche 1: sup brah?
Douche 2: sup bruh?
guy 1: dude they are such big douches
guy 2: yeah i know right? Hey bro, i met this chick i really like. You think you can help me get her?
guy 1: I got your back bro.
by KevJin April 24, 2014

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guys who all think theyre gods gift and hang out together. wear sports wear with skate brands. most likely play sports drink, smoke, party with the cool chicks. guys who all fuck a certain group of girls, banging eachothers girlfriends back and forth but are all still friends. also high socks with logo and vans
bro's
by Kota B August 22, 2012

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