The process of a woman screwing with five male purple headed yogurt slingers at once (left hand, right hand, asshole, vagina, and mouth). The biggest -cock possible is a dodecacock (12) (pentacock plus left foot, right foot, left ear, right ear, left nostril, right nostril, and belly-button).
term used for somebody stupid/ignorant or annoying, or a man with two wieners that can pleasure a girl very good through both holes, but only has one big nut.
A girl saying "wow that peniscock was good last night, my anus AND vagina hurts." Or a dad saying to his son "go clean off the thekitchen table you peniscock!"