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1 definition by Officer Badass

 
1.
A swarm of bro's, or a large group of dudes. Generally, this swarm is heading in your general direction.
"Oh shit, dude bro man. There's a bronsoon heading right for us! Let's party with them!!!"

"Hey, check out that bronsoon. What a bunch of fags."
by Officer Badass May 04, 2007