Bowler's grip 

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!"

Bowler's grip by Charles "Chuck" Nasty September 25, 2008

The bowlers grip 

Where you insert your thumb into the female anus, and place both your middle finger and ring finger into her vaginal passage from the rear. In a simular/same fashion as you would hold a bowling ball.

Ron: Hey man, you go down the bowling alley last night?
Jeremy: Nah man, I did give Carlos' mother the bowlers grip down a different alley last night though.
Both Ron & Jeremy: AWOOGAWOOGAHOOGA!
Ron: Sweet.

The bowlers grip by Top banter. July 7, 2011

Bowlers Grip 

Where the thumb is placed in a womans belly button and the other 4 fingers and inserted into the vagina.

Bowlers Grip. Fisting.

Bowlers Grip by FloatingRedMist December 21, 2010