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.

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.

The teller of cool stories; the coolest storyteller.

close friends; buds; pals; comradarie

"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

A version of a bra specifically designed for men.

Created by Frank Costanza and Cosmo Kramer on the television comedy Seinfeld.
Kramer wanted to name the new device a "bro" while Frank wanted to name it the "manziere". They couldn't agree on a name and the invention failed.

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".