BAMFNINJA Share definition Flag Someone thats so much of a ninja their a BAMF. Person A:Dude look at that kid hes a ninja. Person B:No dude hes not just a ninja hes a BAMFNINJA. BAMFNINJA by BAMFNINJA57 March 28, 2009 0 0 Get merch Get the BAMFNINJA mug. Buy Now — $32.95 See more merch