When one man gently takes his penis out of his pants and then inserts it into another person's asshole. The person who is getting the penis inserted into him or her must be shitting at the same time of insertion. The penis then becomes covered in shit and has a nice chocolate coating on it. Then the person who took a shit then turns around and starts to suck the shit coated penis. This is known as the Poopsie Pop.
Bill had a really yummy tasting poopsie pop the other night after the football game was over.