Title: Mr. Hankey, the Christmas Poo
Original air date: December 17, 1997

Summary:
"Mr. Hankey, the Christmas Poo" is the tenth episode of the first season of the animated television series South Park. It originally aired on Comedy Central in the United States on December 17, 1997. In the episode, the Jewish character Kyle feels excluded from the rest of town during Christmas, and is comforted by Mr. Hankey, a talking and singing Christmas poo. Mr. Hankey does not come alive in front of anyone else, so everyone begins to think Kyle is losing his mind. Meanwhile, the townspeople remove all religious aspects of Christmas from South Park in order to remain politically correct and inoffensive.
http://en.wikipedia.org/wiki/List_of_South_Park_episodes