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When you have any sexual or romantic relations with a bros family member.
Bob is into brocest. Mans fucking Tom's sister.
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by BONTYYYY August 09, 2017
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2
When one "bro" (typically a frat boy) engages in a sexual act with another "bro", regardless of whether or not the two "bros" are actual biological relation.

Potentially the consensual form of brorape.
Todd: Hey bro, me and Chad banged last night.
Brad: That's brocest, bro.
by fazer1 January 27, 2011
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3
What you call incest when two kids are kicking your ass on CoD:MWF2 and giggling on the microphone about it.
"Wtf is this shit on my tv? Incest? Brocest? GTFO."
by Anasaki March 07, 2010
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4
When one bro has sex or does sexual activities with another bro, regardless of if they are related or not
Matt: Me and clint did it last night bro.
Joe: Thats brocest bro.
by Brosephh32 October 04, 2011
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5
When two people within a friendship group, especially two men within a fraternity, start dating and make hanging out as a group feel really weird
Ricky: dude it feels so weird since Johnnie and Marko started dating
Jo-dog: thats homophobic brah!
Ricky: nah dude, its not the gay thing, its just... *gazes off into middle distance* ...thats /brocest/ man
by Skadylan April 18, 2015
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