The fungus is a serious condition that comes to those unfortunate people who suffer from the madness. It's where the anal cavity becomes rotten from excessive anal sex. The anus secreates various bodily fluids. The patient suffers from extreme anal leakage. They are marked by a putrid scent of death and fecal matter. Once a person gets the fungus they are sufferers for life. They can only treat the symptoms by using items like butt plugs and scented tampons. Prevention is the key!
"Omigosh! Look at the trail of poo behind (insert name), I think she has the fungus!"