Top Definition
When an absurdly large amount of bros gather in a common location to partake in bro-like activities, such as: wearing Affliction t-shirts, showing off one's Nautilus tattoo, driving one's raised Ford Truck 350 with a flame paint job, sporting black sunglasses outside at 8pm, threatening to "punch out that little bitch" at a nearby bar, and generally making a mockery of well-accepted human mores and ethics.
"Dude, a surfing competition and a UFC PPV on the same day IN downtown Huntington Beach?! That's friggin' Brosanity!"
by 5aby August 08, 2010
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