Brona Fide Share definition Flag Worthy of a bro; Legitimate; Similar to bona fide but used to refer to weed beer girls and video games. 1)Dude, this is some brona fide shit right here. 2)She is one brona fide slut bro Brona Fide by pissheader February 23, 2010 Get the Brona Fide mug.