Cumdiddlyumpster Share definition Flag A person, usually a female who has loose morals similar to a slut and usually has unprotected sex. That cumdiddlyumpster has sunk the titanic too many times and without a rubber, she practically leaves a snail trail! Cumdiddlyumpster by Daknee September 10, 2010 0 0 Get merch Get the Cumdiddlyumpster mug. Buy Now — $32.95 See more merch