by Karc30 June 03, 2009
A girl with flat butt that has a little sag to it in an unappealing manor, usually in a pair of jeans. A butt that resembles a sagging baby diper.
Man, yo girl gots Diaper Booty. or When that girl turned around, I almost ran from her Diaper Booty.
by SellinUdreamS August 23, 2006
by Granddaddypappi November 27, 2013