F.U.B. Share definition Flag A F.U.B. is a Fat Ugly Bitch "yoooo, your sister is a F.U.B."-"What?" "Your sis i a fat ugly bitch" F.U.B. by Stokley Jones February 4, 2012 0 0 Get merch Get the F.U.B. mug. Buy Now — $32.95 See more merch