Meat Loaf is the stage name of an American rock musician and actor named Marvin Lee Aday. He appears in the Season Two episode, "Chef Aid", where he donates to Chef's cause. In "Chef Aid", he revealed that he was performing under the name Couscous, until Chef brought him some meatloaf and suggested a name change.
Meat Loaf performed the song "Tonight Is Right for Love" with Chef on Chef Aid: The South Park Album. He also appeared in the accompanying mockumentary, Chef Aid: Behind the Menu, in which he talked about Chef's influence on his career.