Play on the word poser, describes a girl who tries way too hard to appear bro-like with the hope of impressing guys. A broser can be found at the beer pong table, wearing some guy's snapback, shotgunning beers, & taking many pictures captioned "my boys".
*Girl walks into a party wearing a Bass Pro Shops hat, yelling about how long she can do a keg stand, and trying to join an all guys game of flip cup*

"Step off, you're such a broser"
by jadjey November 9, 2012
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People who are incapable of ever being bronies but try anyway. These people are hated. they usually do not watch My Little Pony: Friendship Is Magic, they just read fan-fics, edits, and little clips. Sometimes people are called brosers for being ashamed of being a brony, but it is not the correct use.
Brony 1: Look at that broser!
Brony 2: *facepalm* Such a disgrace.
Broser/Brony: Guys, I'm not a broser just because I'm ashamed I like My Little Pony: Friendship Is Magic!
by ositapink01 @ youtube November 14, 2011
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A bro who does whatever is the flavor of the month to try and fit in to all the cliques, but in reality he's just a basic bro that will never mature into a self-thinking adult male.
Chad did yoga to try and impress girls and posted pics on social media so he would seem interesting. Really, he's just a broser trying be cool.
by Sha-brobe March 7, 2017
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Someone who is posing as a bro. Most brosers are people who are incapable of ever being bros. Perhaps they are too nerdy or intelligent, socially awkward, or just don't have the right amount of starch in their collars.
Tom: Did you just see Jave Kelly?

Neil: That's not Jave, that's Nate and he's a broser.
by Alexander Moore October 8, 2007
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