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to forsake the bro-code in anyway; dating a bro's ex-girlfriend, drinking all of a bro's natty ice, etc.
Dane shows up to a party with the ex-girlfriend of one of his bros, to which the aforementioned bro screams "OF ALL THE BRAUDACITY!... WHY HAVE YOU BROSAKEN ME!?"
by DJ Brosiden June 09, 2010