That erection heterosexual men get when A:observing and/or participating in feats of extreme manliness or B: while doing or seeing something extremely Bromantic.
A: Hey man, Turn off the wrestling, it's giving me a broner. B: I was watching the trailer for "Brokeback Mountain", and popped a huge Broner.
By Jesus on crackers
When Two dudes are talking about chicks they have fucked and the dude who is listening to the story gets a boner.
Johnson: the other day i space docked this richously hot bitch at some frat party there was mad poop on her vag. Steve: no fuckin way that just gave me a ragging broner.
By ScrewgongTheDugong
The use of boner as a metaphorical term for excitement, with a play on words of bro. A broner is the excitement a man receives when he's informed of a bro related event that the man is eager to experience. When a man gets a broner, he is not erect it is merely a metaphor for excitement.
Bro #1: "I got us tickets to the Superball!" Bro #2: "Dude, I just popped a broner."
By Regieboy
A completely non gay experience in which one bro observes another bro having an erection. Following the experience, the observing bro may follow with "congrats on the broner, bro."
dude, this is our first broner. I know you're ready for spring break with that flagpole. Nice Broner
By Bromosexual Harassment Lawsuit
Having any kind of homosexual feeling or getting an erection in a homosexual matter.
Dude i think John is getting a Broner for Ben.
By Quinton1019