willknot Share definition Flag When a piece of poop somehow escapes the toilet paper and sticks to an ass hair or two. i.e. dingleberry Dude i looked in the mirror this morning and i had a willknot the size of a golf ball on my ass. willknot by ThE KnOb gObLiN June 25, 2003 0 0 Get merch Get the willknot mug. Buy Now — $32.95 See more merch