The term 'Racing Giant Bobby' refers to the American race car driver Bobby Unser. He was a three-time winner of the Indianapolis 500 and a two-time winner of the Daytona 500. He was also a nine-time USAC National Champion and an inductee into the Motorsports Hall of Fame of America. Unser was known for his aggressive driving style and was one of the most successful drivers in the history of American motorsport.