mad pooper Share definition Flag Someone who poops in anothers restroom and doesn't flush, or claim it. Jarrod shat in the boat's crapper and left it to marinate all night. When no one fessed up to it, he anonomously became the "Mad Pooper". mad pooper by AdamnJenn September 11, 2005 0 0 Get merch Get the mad pooper mug. Buy Now — $32.95 See more merch