Occurs when an illness spreads amongst a group of bros. Usually occurs after a brodeo, brobeque, broadtrip and/or brodown
Bro 1: Hey bro, good thing we didn't go to that brodeo on the weekend.
Bro 2: Ya bro, I heard the Brobonic Plague hit those guys hard.
Bro 2: Ya bro, I heard the Brobonic Plague hit those guys hard.
by Jesus Mary and Broseph November 20, 2009