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It is believed to be derived in the middle of the 20th Century when Americans started usingthis expression. Thoughts come from your brain which is in the top of your head. So if you blurt out facts quickly without having to think about them, then you are talking 'off the top of your head.'

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βˆ™ 2008-04-29 16:33:50
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Q: Where did the saying 'off the top of your head 'originate?
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