ba-dump-a-dump Share definition Flag When an individual has to shit so bad, they began to shake there ass wildly like a music video girl. Damn, that girl got moves! Naw, she just has to ba-dump-a-dump. ba-dump-a-dump by rent-a-butt September 25, 2007 0 0 Get merch Get the ba-dump-a-dump mug. Buy Now — $32.95 See more merch