musrooms or moss that growing in or around the rim of your asshole.
Paul Durso has gnarly butt fungus.
by johann smelts January 26, 2009
A fool, idiot, moron, retard.
You left the food in the oven, you butt fungus.
by Joel Joseph April 07, 2006
A disease of the ass
Brandon has butt fungus and he can't get any dates!!!!
by brandon dinglehoff November 17, 2005
A slang term for "Chronic Anal Candidiasis", or in infection caused by a fungi growth on the anal pore. Not unlike a yeast infection, the symptoms include severe itching/burning and a smelly fuckin' white discharge.
"Dude, I can smell your buttfungus...you should have that looked at."
by Colonel Turdburglar July 22, 2005
Discusting, moldy fungus, growing around, on, or inside a person's butt.
Doctor:I had a patient come in today with some nasty butt fungus, he asks if I would clean it for him. I said" Hell no!!!!!!!!!!!!"
by JOOOOOOOOOOSE January 17, 2010
The redness of the arse.
OMG you are as red as the irritating skin from the babies diaper that caused buttfungus!
by Optical Illusion January 25, 2011