When the middle finger and/or other fingers are inserted into the vagina and the thumb is used to stimulate the clitoris. Requires impressive dexterity, and if mastered leaves the other arm free to stimulate other body areas.
"I finally figured out how to bowlingball, so now I can finger a chick, and rub her tits!"

"Dude, my fingers are locking up from bowlingballing for so long!"

"Mike, you can't move your thumb fast enough to bowlingball me, just use your other hand."
by Pirate JJ November 12, 2008
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a sexual act in which a man/woman eats out a girls ass while shoving his or her entire hand into the girls vagina
blackass wants sexmachine to give her a rusty bowlingball .,
by Z4cky fr!ction October 27, 2008
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when you take your middle and ring finger and place in the vagina and then place your thumb in the rectum
dude i gave her the bowlingball grip, two in the pink one in the stink
by fatboy one April 4, 2006
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