dumpoop Share definition Flag a complete idiot who has literaly no brains and is useless kid1: wow tommy is a dumpoopkid2:ikrTommy:HEY!!!! i know math 1+1=3 seekid1 XDkid2LOL dumpoop by ninjassassin248 July 11, 2010 0 0 Get merch Get the dumpoop mug. Buy Now — $32.95 See more merch