Some info and a short description of this South Park episode on South Park Zone:
South Park - You Got F'd in the A which is often titled You Got... or You Got Served on television listings, is episode 115 of the Comedy Central series South Park. Originally broadcast on April 7, 2004, this South Park episode and also its title represent a satire of the movie You Got Served, which was released earlier that year.
In this South Park episode, Stan recruits a Goth, a Raisins girl, and a Dance Dance Revolution master for making a team in order to compete against a group of breakdancers coming from Orange County. In the meantime, Butters has strange flashbacks of causing death and chaos at a tap dancing contest.
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(The complete plot for this South Park Episode)
Stan and his friends are playing with R/C cars (radio controled) when a group of kids from Orange County come and dance in front of them, "serving" them. The group leaves after trash-talking Stan and the boys, who are left confused by the confrontation. The kids talk to Chef, unaware of what being "served" entails. Chef immediately shows great concern, and calls their parents to inform them about the ordeal and assure them that their children are all right. Later, over dinner, Randy Marsh gets upset about his son's being served and "teaches" him to dance back with a few very basic line dancing steps to the tune of Billy Ray Cyrus's "Achy Breaky Heart".The next time Stan gets served by the Orange County kids, he serves them back, switching CDs on the boombox so that he may dance to "Achy Breaky Heart". "You just got F'd in the A!" says Cartman to the Orange County kids, who respond by declaring that "it's on"; there is now a dance contest to be had, the Orange County kids versus the best dancers in South Park.
Mrs. Marsh berates Randy about his telling and teaching Stan to dance back, as it was this which led to it being on. Randy goes to the Orange County team to apologize and make it clear that "it's not on; it's off", but the Orange County coach takes this as a challenge and goes on to serve Randy with some exceptional dance moves. Randy winds up in the hospital with the worst case of "being served" that his doctor has ever seen.
Stan goes out to find the town's best dancers: the leader of the goth kids' gang, an Asian kid named Yao, who is a Dance Dance Revolution expert (yet claims he cannot dance without the machine, a pastime he perceives as stupid); and Mercedes, the manager of the Raisins girls. Needing a fifth member, Mercedes suggests Butters, who was once state tap-dancing champion. When they ask him to join, however, he is stunned and runs away screaming.
It is revealed through flashback that, in 2002, his shoe flew off during the national Tap-Dancing Finals, hit a stage light in the rafters and led to an extremely gruesome chain of events that left eight people in the audience dead. This all happened to the upbeat tune of "I've Got Something in My Front Pocket for You". Butters flatly refuses to participate in the show, even after further pressing, so the team has to settle for a dancing duck named Jeffy from a local farm. Jeffy has not danced to any songs other than those about drug use and domestic violence played by the farmer, all to extensively modified lyrics of the song "The Crawdad Song".
On the day of the performance, Jeffy's ankle gets sprained during practice. The team looks likely to be forced to forfeit, as competition rules require a mandatory five members. Just in time, though, Butters suddenly arrives in his tap-dancing outfit, allowing the kids to perform. When they do, however, Butters' shoe flies off again and hits a stage light, causing the rafter to fall on and kill the entire Orange County team and their coach. Although Butters is horrified by this, the South Park team wins by default, and a bloodstained, screaming and horribly traumatized Butters is carried off and hailed as a hero.