All manner of fat jokes aside, Cartman excels at eating pussy. The first time he does it is with Wendy, two weeks before the Big Breakup. She pulls his hair and calls him Stanley by mistake. It's not as finger lickin' good as KFC's gravy, but it's goddamn close.
She insists she'll cut him off if he doesn't curb his bad behavior, and Cartman believes her-the stingy bitch that she is. In the end, she's the one who ends up addicted; Cartman is the only one who can tongue her til she sets off like an unlocked fire hydrant.