Pomplemousse Share definition Flag French for 'grapefruit', often used as a pejorative term for Mariah when she does something silly or mockable. 1: Hey! 2: Bonjour! 1: You're a pumpkinhead! 2: Bien sur? Donc, tu es une pomplemousse! 1: Qué? Pomplemousse by PenguinAssassin May 2, 2010 0 0 Get merch Get the Pomplemousse mug. Buy Now — $32.95 See more merch