Clandestine violator
An individual thats sneaks around
communal showers or crowded dance floors covertly engaging in sexual contact then disappearing before the victim is able to identify them.
Clandestine violator is general term used to describe an individual that engages in any covert touching of unsuspecting victims genitalia.If the violator checks someone's oil with his/her thumb while in a communal shower they become a
rusty ninja.