From Grant Barrett, lexicographer for The Official Dictionary of Unofficial English, Double-Tongued Dictionary: Slang, jargon, and new words from the fringes of English.
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e.g. cheddar curtain n. the divisions real and imagined that separate Wisconsin from neighboring states, especially Illinois. Also cheese curtain. Related: Sconnie, Wisconsin, English
Editorial Note: This term is parellel [sic] to Orange curtain, cotton curtain, and other, similar terms.
Citations: 1992 Chicago Sun-Times (Aug. 7) “The Mix” p. 5: Lift the cheddar curtain. The Wisconsin State Fair celebrates its 100th year in its current location at State Fair Park in West Allis, Wis., through Aug. 16. 1993 [Julian Macassey] Usenet: alt.tasteless (Nov. 10) “Re: Tasteless Secret Santa”: At that time of year (Feb, March), I will probably be in Wisconsin. So I will fly back from behind the Cheddar curtain. 1994 [Bob Christ] Usenet: alt.tasteless (Jan. 14) “Re: Rock ‘n Roll for geezers”: He’s done it! Julian has moved behind the cheese curtain. 1994 [Joseph Betz] Usenet: talk.bizarre (Oct. 12) “Re: Longest Known Palindrome”: Wisconsin—Behind the Cheese Curtain. 2003 A. Forester Jones Yellow Snow (June) p. 65: The pilot announced that they had crossed the “Cheddar Curtain” and were over Wisconsin. Adam started visually searching the land below for large warehouses stuffed with surplus cheese. 2005 Northwest Herald (Chicago) (May 23) “Don’t let road work ruin travel”: People heading to Wisconsin can find information about road construction behind the cheddar curtain by logging onto http://www.dot.wisconsin.gov. 2006 Bike Black Ribbon (Milwaukee, Wisconsin) (Nov. 19) “BBRS Ride with the Bums”: Mid November, behind the cheese curtain is not known for its balmy climes or great trail conditions, but this particular November day turned out to be dry, with a few peaks at blue sky.