0 It's a reference to the movie "The Wizard of Oz," starring Judy Garland - can't remember the year, 1939 maybe. In the movie (which was based on a children's book by L. Frank Baum) Dorothy is carried by a tornado away from her home in the flat, dull Kansas farmlands into a wonderful, magical world peopled by little Munchkins and ruled by the Wizard of Oz, who lives in the Emerald City.
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Anonymous"cool one's heels" can be expressed as "kick one's heels"Just guessing, but I don't think this one (with 'kick') made its way across the Atlantic.