Cartman's Mom is a Dirty Slut is episode 13 of Comedy Central's series South Park. This is part 1 of a two part episode; the second part is Cartman's Mom Is Still a Dirty Slut. It originally aired on February 25, 1998.
In a classic cliffhanger, 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 then he thought. Based on everyone's best recollections of the time, candidates for the identity of Cartman's father are limited to Officer Barbrady, Chef, Jimbo, Ned, Mr. Garrison, Chief Running Water, Gerald Broflovski, Dr. Mephisto, Kevin, and the 1991 Denver Broncos. Dr. Mephisto is willing to perform DNA testing to resolve the issue, but requires $3,000 for the test. In the meantime, Kyle, Kenny, and Stan videotape Cartman having a tea party in his backyard with stuffed animals. They come up with the idea to send the video into America's Stupidest Home Videos for the chance to win $10,000. Cartman then approaches Kyle and Stan (Kenny was since killed by a train) with the depressing news about his lack of funds to find out his real father. Stan and Kyle agree that if they win the video contest they will give Cartman the $3,000 needed for the DNA testing. Cartman is overjoyed, but quickly becomes extremely angry after seeing the aired video.Cartman looses but comes in second with the $3,000 dollar prize enough for the DNA test. The narrator concludes the episode with a cliffhanging question "Who is Eric Cartman's father?"
The storyline was resolved in the episode "Cartman's Mom is STILL a Dirty Slut".