Someone who vigorously masterbated frequently. Also, has no scruples for the time or place that the masterbatory overtones eminate from.
Places to cath these deviants:
The porta-potty at a Britney Spears concert.
A bathroom stall during the senior prom.
The toilet while at a raging party.
In the parking lot waiting for a friend to buy a soda at the mini-mart.
At a sleepover at a friend's house while everyone is asleep.
Your mom's house during dinner.
Jimmy is such a SPUNK KNUCKLE. He was caught jerking himself by my aunt in the bathroom stall at the funeral for her dead cousin. What a Battered Cavern!