pamperbutt Share definition Flag A person (usually a guy) who has a big, saggy butt that resembles pants over a diaper. That dude over there has a pamperbutt... His chunky ass looks like he's sportin' a shit-filled diaper. pamperbutt by bobbarooba September 2, 2009 0 0 Get merch Get the pamperbutt mug. Buy Now — $32.95 See more merch