BAMF Share definition Flag Can be used in two ways: "Bad Ass Mother Fucker" or "Bad Ass Mo Fo." Either way, it means the same thing... Guy 1 - Dude, look at that guy eat all those burgers! Guy 2 - I know. What a BAMF. BAMF by Dr. What's-his-name May 13, 2008 0 0 Get merch Get the BAMF mug. Buy Now — $32.95 See more merch