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1.
A sexual act in which one person grabs a female with their fingers in both lower holes, simulating the holding of a bowling ball.
"Last night I was fingering her and totally did the bowler's grip...it was awesome!"
by Charles "Chuck" Nasty July 31, 2008
 
2.
Where the thumb is placed in a womans belly button and the other 4 fingers and inserted into the vagina.
Bowlers Grip. Fisting.
by FloatingRedMist December 21, 2010