Joe: Woah! Look at you, you little scrumpet butt!
Emma: What's a scrumpet butt?
Joe: It's a sexy, perfect, round, and juicy ass, like you got hanging off your backside, honey!
Cross between scrump and crumpet, i.e.- Sex Biscuit. Commonly used in the South by people who live on mountains and have a deep southern drawl, or widely used anywhere you can find both sex and biscuits.
"Man I shore do love your scrumpets Jeeiimmm, they are goo-ood! Howsabout cookin me up a fresh batch of them there scrumpets"