Bowling fingers 

when someone inserts three fingers into a woman as such:

Two in the "pink" and the thumb in the "stink"

last night I gave Karen the "bowling fingers" she squirted big time.

Bowling fingers by Frank McFresh May 6, 2020

Finger Bowling 

-verb

To stick your thumb in your man's ass while your middle and ring fingers fondle his balls.

"I can't get my nails did, I'm going finger bowling."

Finger Bowling by emm aka bella April 17, 2010

three Finger bowling 

Three Finger Bowling is an old school term used in place of the shocker.

Father: Son, what is the shocker?
Son: (explains)
Neighbor: Ohhh we used to call that Three Finger Bowling!

three Finger bowling by Marcus Quincy July 16, 2006