cheddar curtain n. the divisions real and imagined that separate Wisconsin from neighboring states, especially Illinois. Also cheese curtain. Editorial Note: This term is parellel to Orange curtain, cotton curtain, and other, similar terms. (source: Double-Tongued Dictionary)
Further reading
A listener named Mark now lives in San Diego, California, but grew up in Chicago, Illinois. There, he recalls, when he and his friends played sandlot baseball, cards, or board games, if an opponent tried to get around the rules and then got called...
Among biologists, a frog’s croak is known as an advertisement call. It’s a male frog’s way of making himself known. A Wisconsin listener says children in her area learn that this sound is jugarum, jugarum. Poet and editor Willard Espy...