grind off:

Of a male, to masturbate (and ejaculate). See masturbation-male for synonyms.
See Also: all day, all night, blow the groundsels, camp it off, Chew my shorts!, flip it around, fuck off, interrupted coitus, Jackie, jerking iron, jerky, jump off/out at..., light up, off, on, pound it, prick rag, roll the rolls, shoot, slow exotic, squeeze it off, squeeze off, tear off a piece (of ass), turnpike, unass, walkout, wank stick, whack off, whank off, WOOPIE, work one's ass off, yanker, YMCA

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