Girbroni Share definition Flag Guys that just aren't cool, but think they are. Almost like douche bag, but not exactly. "Hey, what you think about your sister's new bf?""I don't like him. He's a real girbroni." Girbroni by Zacharias* February 25, 2010 0 0 Get merch Get the Girbroni mug. Buy Now — $32.95 See more merch