A game similar to "Soggy Napkin" or "Salty Cracker". A group of young men masturbates en masse into a mug. Once all are finished, the resulting mélange à sperm is transferred to a turkey baster, whence it is squirted into a woman's vagina at the peak of ovulation.
Nine months later, the identity of the father is established, and all others must pay homage to the potency and virility of his manhood.
Everyone agreed that the winner of Gushin' Roulette was Christopher, due to the baby's flowing blond locks and blue eyes.