The song's running gag has Rubber Duck complaining about the smell of the hogs that Pig Pen is hauling. He repeatedly asks the offending driver to "back off" (slow down). By the end, Pig Pen has fallen so far back, when Rubber Duck is in New Jersey, Pig Pen has only reached Omaha, Nebraska (a reference to the headquarters of American Gramaphone, which released the song, and also a reference to the slaughterhouses for which Omaha is famous). Also, Omaha was C.W. McCall's "home 20" (a reference to the ten-code for location).