jack off

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun idiomatic, colloquial, vulgar, pejorative An annoying person or one who has committed a transgression with no or insufficient apology; a jerk, an asshole.
• verb reflexive, transitive (colloquial, somewhat vulgar) To masturbate oneself or another person.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb get sexual gratification through self-stimulation