dat ass Share definition Flag To see a female derriere and have the emotional response to bit the bottom lip while wearing expensive sunglasses. *sees picture of a tight female ass* *puts on expensive sunglasses and bite bottom lip* "DAT ASS." dat ass by kanye west's sunglasses March 30, 2009 0 0 Get merch Get the dat ass mug. Buy Now — $32.95 See more merch