be whistling Dixie

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be whistling Dixie

slang To have an unrealistic, usually overly optimistic, view of something. "Dixie" was an anthem of the Confederacy, the losing side of the US Civil War. Primarily heard in US. You're whistling Dixie if you think we're making the playoffs this year.
See also: Dixie, whistle
References in periodicals archive ?
At first I thought they were whistling Dixie because I did not have a farm, just a huge front and back yard and felt that COUNTRYSIDE would not serve my purpose of reading short, real-life and genuinely helpful articles that came from those that had done what I was trying to do in a smaller area