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When a bro has or gains a "boner" (enlarging/hardening of the male penis or shlong)
Damn that pezza gave me a massive broner
Broner by Caponer/ale July 25, 2009
A Bro, or dude, who gets an erection when no girls are present.
John: "What the fuck Steve, you have a broner right now!"

Steve: "Oh...no thats just my pants...."

John: "Whatever man your a fucking homo."
Broner by Landerman November 5, 2009
When a male randomly gets an erection while in the presence of his male friends.

There is nothing sexual about it.
Guy one: Dude, why do you have a hard on, when I'm the only one around?

Guy two: It's a broner dude, don't worry.
Broner by I say, now. February 5, 2010
A bromantic dinner. A dinner between two heterosexual males having a bromantic relationship.
Yo bro, you free tomorrow night for a broner? I don't know if i should dump this bitch for her mom.
A woman-one walks by you and your bro
Upon brofisting, either one of you exclaims "bro! I totally have a broner!"
Broner by johkabu October 20, 2010
A bro who has a boner but is very chill.
I was telling my bros how I was playing cod when i got a nuke and a sandwich, and immediately got a broner.
Broner by NattyIceKing April 2, 2011