rub one out

From the notion of rubbing out seminal ejaculate of one’s penis.

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rub one out (third-person singular simple present rubs one out, present participle rubbing one out, simple past and past participle rubbed one out)

1. (intransitive, slang, vulgar, usually of a male) To masturbate manually to the point of orgasm.

   Synonyms: rub one off, rub oneself off; see also Thesaurus:masturbate

   • 2012, David Wambaugh, The Last Call, page 178:

     Irish sounded serious when he said, “Oh, yeah, dog, if you get caught rubbing one out in the joint, you're fucked.” I said, “What's rubbing one out mean?” He cackled, and said, “Whackin' off, chokin' your chicken, spankin' the monkey. Come on dog, don't play stupid.”