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Any suburb of the Chicago area. I came up with this term because people who are actually from Chicago get pissed when a suburban person says they are from Chicago. Hence: Diet Chicago.
Person #1: Where are you from
Person #2: Chicago
Person #1: Cool, where in Chicago?
Person #2: Oak Lawn. (or any other suburb)
Person #1: Ok, you're from Diet Chicago....
by Mikaa August 24, 2009