that the term "couch potato" (which means sitting around all day and watching television) can be traced to Tom Lacino of Pasadena, California? He was a member of a group that humorously opposed the exercise and dieting fads of the 1970s. He made up the term on July 15, 1976 in a telephone conversation. He said his life focused on the "Boob Tube," a name for TV. And since tubers is another name for potatoes, Lacino coined the term couch potato.
Source: Everything but the Kitchen Sink by Frieda Wishinsky and Elizabeth MacLeod