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1.
verb.
to part take in an inherently homosexual act, or to display homosexual tendencies or behaviors with a person of the same sex.

applies mostly to macho, heterosexual males and excludes intentional, playful displays of homosexual behavior; should be used in sentences in second and/or third person (you and he/she/it, respectively); and is best when used in a narrative or observation.
at last night's party, jeff and mark were definitely bro-backing, as they slow danced together on the patio.

-or-

dude, we totally saw you bro-backing with that guy at the bar last night.
by mingkai April 19, 2008
 
2.
A homosexual bro. A bro who prefers the company of bro's to bro-ho's.
Dude, did you see the way Matt and Trav were hangin all over each other? Totally Bro-Back Mountain style dude!
by Kellie June 19, 2006
 
3.
a throwback jam that only you and your bros know.
dude sugar were going down by fall out boy is our fucking broback
by Max danger bean September 03, 2011
 
4.
Verb: To pay a bro back with a similar gesture with no specific deadline, whenever is most convenient.
1: When your buddy J-Bowks spots you tickets for a movie and agrees to let you pay for whenever next time you guys go to the movies.

2: When your buddy Willy Poo spots you a fatty in exchange for another whenever you happen to get one.

TD:"Fuck man I'm broke as dicks, spot me a (enter desired object/interaction here) (giggity)."

JB:"Yeah its cool man just broback me whenever."
TD:"Sweet man. Thanks dude I owe you."
JB:"Damn right you do."
by MM Pheonix May 18, 2014
 
5.
An old Bro (throwback bro) Think of the old days with you and just your bros. These older bros usually sport a fake tan, cutoff T, athletic visor, almost hot girlfriend, and a "not to be fucked with" attitude. They usually show up when there is a some kind of game on TV involving monkeys throwing balls around.
by Broseph of Arimathea July 25, 2013
 
6.
1. noun. portmanteau of “bro” and “blowback”; when a decision unexpectedly creates explosive tension with one’s bros. Not to be confused with brobacking.

2. verb (often 'brobacking'). portmanetau of "bro" and "bareback"; when two bros end up having unprotected anal sex, probably just this one time.
1. “Dude, why is Jeremy so pissed at you right now?”
“Well dude, I banged his sister; he always used to joke about it, so I assumed it would be fine. But after he found out I really did it, I’ve been experiencing a lot of broback.”
"Wait you fucked Jeremy?"
"WHAT? No dude, that's broback*ing*."

2. "Dude why is Jeremy acting so weird around you lately?"
"Look, it's complicated, and I don't really want to talk about it..."
"OMG were you brobacking Jeremy?????"
"No!! No!! I uh...I banged his sister! yeah, that's it..."
"Oh, so it's just broback. Whew."
by Merryman Webster May 31, 2013