Rum Tum Tugger is a colloquial term for an actor or musician who has a sexual conquest with a member of his/her audience after a performance. Derives its name from a character in Andrew Lloyd Webber's musical "Cats" on account of Rum Tum Tugger's curious affinity for breaking the imaginary fourth wall and entering the audience.
You little Rum Tum Tugger you! I knew that you would sleep with that girl from the second row!
Easy there, Lyndsay, just because I talked to your sister between Acts doesn't mean I am trying to Rum Tum Tugger.
Break out the makeup, my cat costume, and have the set guy give him a backstage pass, I'm up for some Rum Tum Tugger action tonight!