Fall Off The Turnip Truck Meaning

(chiefly US, idiomatic) To be naive, uninformed, or unsophisticated, in the manner of a rustic person.

Example: 2006, "Opinion: The Picture of Stupidity," New York Daily News, 14 Feb. (retrieved 16 Sep. 2008):
  Doesn't it strike you as funny that this city, which prides itself on its erudition and sophistication, can oftimes get suckered like a bumpkin who just fell off the turnip truck?

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