Bros are a social group among young adult males. There are 2 different types of bros.

1. Frat Bro's
(Short for Frat Brothers)
Usually ranges from ages 17-22
Frat Bros are a group of guys in a college frat club. (Like sorority sisters, but all guys.)
The Look of a generic Frat Brother is a sun vison worn frontwards, backwards, cocked to the side, or even upside-down. Their hair is usually blonde and could possibly have highlights. They Usually wear some sort of preppy, bright colored, collard shirt, (Exp. Hollister, areo, abercrombie ect.) with plaid or board shorts and flip flops.
Frat Bro's are usually seen partying, drinking, or spending daddy's money.

2. Bro's
(Ages usually range from 14-32+)
Bro's are a group of guys that like/practice extream sports such as: dirtbiking, BMX, or racing, ect.
The genaric look for a Bro is: Some kind of fitted hat worn backwards, or frontwards, with the brim bent upwards. Normally have a buzzed head. And wear a black tanktop or some kind of bro shirt. (Exp. Metal Mulisha, So Cal, FMF, SRH, 187 inc. ect.) And Sagging dickies or basketball shorts, long crew socks, and some sort of large skate shoe or small Vans slip-on shoe.
They usually have at least a few tattoos and/or Piercings. Bro's are usually seen partying, drinking, doing extream sports or activities, and driving high rise trucks with some sort of bro sticker on the back windows.
1. Did you see that "Frat Brother," party on campus last night?

2. My neighbors are "Bro's," and they always ride their dirtbikes and trucks up and down the street.
by dats2dope March 08, 2010
Get a Bro mug for your mother-in-law Julia.
a bro is a sweet surfer brah. if hes not playin lax, or surfin, hes sittin in his hammock, playing some jack johnson songs. Bro's always drive Jeep Wranglers with the surfboard out the window. They wear Reef Sandals, boardshorts, oakley sunglasses, and a Camp STAFF shirt. They are also always seen twirling their lanyard or whistle. Bros are most commonly lifeguards that where ricepicker hats and play lax on the beach.
Keannu just surfed a killer swell with a lax stick in his hand. What a Bro.
by K-Brah January 10, 2008
Get a Bro mug for your barber Beatrix.
A male usually in college, who hasn't realized he is a homosexual yet.
Bro1: yo Bro, I really love the way those D&G sunglasses look on you.

Bro2: Thanks Bro, lets take our shirts off and play horseshoes on the front lawn.
by Shockzillllla July 17, 2009
Get the Bro neck gaiter and mug.
Lesbians who think they are men. They dress and act with "men" characteristics or traits. Until its that one week of the month where the Big Guy upstairs reminds them that they are in fact of the female gender.
I saw these two guys, but they were actually two Bros.
by The Real Spic June 18, 2016
Get a Bro mug for your cat Manafort.
Bros are people of a secret society. Not like the bros of college or those types, this goes deeper into history. The first bro came from Ancient Greece and has quickly grown from then. They are a nice group of people, but if fucked with, will fuck you over too. Bros meet in conventions called Brassemblies. Can be local or international, and everything in between. The structure is selected by Adrien Brody, master of all bro's. He selects every leader of an area, and Bresidents, etc. The main focus of the Bros are to become a group of people who do many things together. Everyone as a bro is a bro to everyone.
Guy 1: Did you know Obamas real name is Brobama?
Guy 2: Hmm, thats cool
College Bro: Hey guyz, wht are you guyz talking about broham?
Guy 1: SECRET LEAKED, GET HIM
by titopei December 02, 2010
Get the Bro neck gaiter and mug.
A guy who loves the gym, his truck, and his vape pen. Usually found wearing tap out brand clothing and sunglasses when it's not even sunny.
you vape bro?
by Skibabyy18 July 01, 2015
Get a Bro mug for your daughter-in-law Zora.