spidery-ass Share definition Flag A skinny girl, usually of african descent, who has a large, but high backside resembling a spider's pygidium. That spidery-ass bitch, I'll punch her in her jaw bone. spidery-ass by Jocie September 2, 2007 0 0 Get merch Get the spidery-ass mug. Buy Now — $32.95 See more merch