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i wonder if tongue-in-cheek is the same as " Emotion: stick out tongue " (smiley).
or can someone explain to me why (the origin) tongue-in-cheek means humerous/facetious ?

thanks a lot
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Wikipedia has a decent explanation of it.
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PhilipWikipedia has a decent explanation of it.

That is not a way to answer though wikipedia does have great and proper explanations to most things.Emotion: rolleyes