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.