From Rocklopedia Fakebandica
The Flintstones. Um, it's a parody of "The Twist," but also a swipe at Elvis' redneck accent. He gets sick and Fred looks enough like him to be forced to lip-sync to the song on stage pretending to be him. Hal Smith was the voice of the cornpone-sounding Rock Roll. The song was written by William Hanna and Joseph Barbera.