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!"
Black Peniscock is my favorite type of cock. It's oversized and has chocolate flavor on the outside. But there's a special surpriseon the inside with delicious creamy feeling.