An act in which three partners (2 girls 1 guy) engage in a sexual activity. In said activity the guy has sexual intercourse (vaginal or anal) with girl A proceeding to ejaculate inside of her. Girl A then proceeds to stand over girl B (whilst girl B opens up either her vagina or anus) and girl A release the "wiffleball" into girl B.
Brian- Dude, I hooked up Susan and Naomi last night.
Justin- Were they Tossing the Wiffleball?
Brian- Of course
Justin- Your sick
Brian- I know