It is the chocolate fudge you can's seem to wipe off from your ass hair after a huge crap. It gets crusty when it drys and hurts like a bitch when you wish to clean it off.
it's when your mom craps on you while giving birth and since some baby's dont have hair when you're born your mom will think it's your hair for a while
After you take a deuce and don't wipe you ass properly you have a tendency to create shit crust. This is most noticed when excersizing, you have a burning sensation in the poo hole region. Also caused by having wet farts due to spicy foods.