When you have a really bony spine and a girl grinds her vagina on it for pleasure. Hurts at first, but your back feels great the next day.
John: "Dude I heard you fucked Sarah last night"
David: "Yeah and she gave me a vaginal chiropractor. Hurt like shit at first, but my back has never felt looser."
by darfielg December 12, 2014
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