The lint from your underpants that gets caught between your butt crack and cemented together by sweat and natural body grease concentrated around that area.
Someone would say: Every time I have a shower and watch my butt crack I get bum fodder on the washer.
BumFodder is an annoying person who has joined newgrounds and goes on the the forum and can be banned sometimes and has a few enimies and thinks Newgrounds is the best!
ME! I'm BumFodder, so nobodyelse can be him MWAHAHAHAHAHA!!!