Butt nugget Share definition Flag A nugget of poo from the butt. usually brown. Sometimes red. Mostly found in mexico and africa. Ew that new kid, tyler looks like a butt nugget.Be quiet Sabrina, your such a butt nugget. Butt nugget by plunesance3082MSD December 11, 2011 0 0 Get merch Get the Butt nugget mug. Buy Now — $32.95 See more merch