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The act of jerking off, or stroking your cock while engaging in intercourse. The act has one, two, and three finger variants; however, the three finger variant is the original form. Performed by inserting your pointer finger, up to and including your middle and ring fingers, into the woman's vagina under the shaft of your penis. Then gripping around the shaft leaving the thumb exposed over the top near the clitoris. Once held into position you proceed to stroke yourself while performing intercourse.
Ex 1:
Man A to Friend A:
"Last night was wild, I even gave her the Ol' John Handcocker."

Ex 2:
"Angelique's pussy was so loose and wet I had to give her the ol' John Handcock to finish us off."
by TeoDee September 13, 2017
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