turn the knob:

To masturbate , said of males. See masturbation-male for synonyms.
See Also: 5-alpha-reductase, advanced in years, anal fissure, arse up, bambi effect, booby prize, break luck, Circe, dual dildo, intermediate sex, joyknob, knobster, nobs, perpetual emotion, pull a trick, toss freaks, triple header, turn (someone's) head, turn a date, turn a trick, turn off, turn on, turnpike, visible panty line

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