Green’s Dictionary of Slang

to insert the thumb into a woman’s anus and the middle finger into her vagina simultaneously, doing a rhythmic swinging motion of the arm to provide sexual stimulation.

1972		B. Rodgers Queens’ Vernacular 130: to masturbate a woman with a pincers movement of a clitoris-rubbing thumb and an anus-tickling forefinger [...] do the bowling hold; hold a bowling ball.
1997		Roger’s Profanisaurus in Viz 87 Dec. n.p.: tenpin v. To place digits simultaneously in the tea towel holder (qv) and the fish mitten (qv). From ten pin bowling.