Wiktionary
jack off
n. (context idiomatic colloquial vulgar pejorative usually a male English) An annoying person or one who has committed a transgression with no or insufficient apology; a jerk, an asshole. vb. 1 (context reflexive intransitive colloquial English) To masturbate. 2 (context transitive colloquial somewhat vulgar English) To manually stimulate someone sexually, generally a male.
WordNet
jack off
v. get sexual gratification through self-stimulation [syn: masturbate, wank, fuck off, she-bop, jerk off]
Usage examples of "jack off".
She herself swabbed Jack off, dressed him in a bellyband, a diaper, plass overpants, and a little terry-cloth suit, then stowed him in his swansdown bunting and cradle furs while she washed herself and put on a fresh nightgown.