BAB Share definition Flag Stands for Bitch Ass Bitch. An acronym for someone who is acting like a real swanky ass hoe bitch. Shit fam, he's being such a BAB right now with his rainbow dash hoodie. BAB by yoloboi6969 September 10, 2016 0 0 Get merch Get the BAB mug. Buy Now — $32.95 See more merch