The term 'Daddy-O's' is a slang term used to describe a certain type of person in the 1950s and 1960s. It was used to refer to a man who was cool, stylish, and hip. The term 'HEPCATS' is also a slang term from the same era, which was used to describe someone who was fashionable and up-to-date with the latest trends. Both terms were used to describe people who were considered to be trendsetters and trend followers.