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1.
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 26, 2008
 
2.
Sexual act in which a man or woman eats out a girls ass while sticking his thumb in her ass and 2 fingers in her vagina.
Oh my God, theres that chick I gave a Rusty Bowling Ball to on Tuesday.
by eddie addams January 31, 2011