by 
Thommy
ANSWERS: 2
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It's actually "had a wild hare", as in a rabbit. It's an American expression meaning to do something at the spur of the moment without really thinking, spontaneity. It originated from "had a wild hare up my <insert rated "G" synonym>". If you had a wild rabbit in your backside... you'd probably jump without thinking. It most likely originated in the Mid-West where hare were commoner'n a fly on a horses' .. (and so was vulgar language). But as it was shaved down, it can now be used as "I had a wild hare to go to Vegas".
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I was looking for the answer to this as well. It looks like Scoundral is on the right track but maybe combined the "wild hair" expression with the "wild hare" one. Take a look at this article for a full explanation: http://www.blogdom.org/archives/001061.php
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