South Park — Episode 13: Cartman's Mom Is a Dirty Slut

You are watching the episode Cartman's Mom Is a Dirty Slut Cartman needs to find out who his father is but his mom is no help. Learning that his father could be one of the many people that his mom had "relations" with during an annual party called "The Drunken Barn Dance", he finds that there's more to his mother than he thought.