Mama Rump Share definition Flag An ass of a black woman, since black women always have very large asses. John: Whoa, look at Fanaynay's ass, its huge! James: Ya, real mama rump!Fanaynay: Say what?! Mama Rump by Terce-Taur September 22, 2009 0 0 Get merch Get the Mama Rump mug. Buy Now — $32.95 See more merch