Cartman's Mom Is A Dirty Slut

"Cartman's Mom Is a Dirty Slut" is the first season finale of the animated television series South Park, and the 13th overall episode of the series. It originally aired on Comedy Central in the United States on February 25, 1998. It is part one of a two-episode story arc, which concluded with "Cartman's Mom Is Still a Dirty Slut". The episode follows Eric Cartman, one of the show's child protagonists, becoming curious about the identity of his father. He discovers that his father is most likely a man his mother had intercourse with during an annual party called "The Drunken Barn Dance". Meanwhile his friends Stan, Kyle and Kenny participate on America's Stupidest Home Videos, after filming Cartman playing in his yard with plush toys.

The episode was written by Trey Parker and staff writer David A. Goodman, and directed by Parker. It featured a guest appearance by comedian Jay Leno, who provided cat sounds for Cartman's cat. "Cartman's Mom is a Dirty Slut" had a cliffhanger ending; the identity of Cartman's father was intended to be revealed in the second season premiere, but Parker and co-creator Matt Stone wrote an unrelated April Fool's Day episode instead. This was much to the dismay of South Park viewers. This episode was met with positive responses from critics.