Beating the meat?
Choking the chicken?
Spancking the monkey?
Whacking oneself?
Whipping one's own ass?
Dressing like a pinata and walking down the street?
I'd say it's when a modtard decides to impose his own definition of perversion amongst the masses by issuing excessive points and closing a thread on a relevant topic that he thincks is perverse. Abuse is sure to follow. Self abuse would be more than appropriate. I have a baseball bat he can use.