The unintentional but unavoidable girth/tightening in a heterosexual male's pants due to the witnessing of another male's unbelievable stunts and/or acts.

Most common triggers to cause an unavoidable broner include but are not limited to, are: Chuck Noris, Jason Statham, Arnold, The show 'Cops', Showcase Action.

To calm a broner down, one must immediately watch 10 mins of any of the Twilight movies. Or listen to something by Lady Gaga. Actually, any attention to something that resembles a male covered in glitter, and lots of make up should do the trick.

A slang term used to explain the phenomenon during which a fiercly heterosexual male achieves an erection (or, "boner") for or while in the company of one of his male friends (or, "bros"). This may only occur while engaging in all-male activities, particularly those which include feats of strength or displays of hyper-masculinity. Upon achieving a broner, the man in question is often known to exclaim, "dude, suck that shit!" or "meet me in the shower."

An unintentionally manly inspired boner.

When a fan of my little pony get's an erection.

An unintentional man-inspired boner

The accidental erection, or boner, induced by a male friend.

An erection inspired by the actions of your buddy- be they sexual or just plain impressive.

An unintentional boner from your guy friend.