The term 'TV Uncle' is a reference to the character of Uncle Miltie, played by Milton Berle, on the 1950s television show 'Texaco Star Theater'. Uncle Miltie was a popular character who often appeared in sketches and skits. He was known for his comedic timing and physical comedy, as well as his catchphrase 'You ain't seen nothin' yet!' Uncle Miltie was one of the first major stars of television and helped to popularize the medium.