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1. 

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   1-30-12

   dawn says:

   The expression indicates that something is not being said seriously. The intent is sarcastic, ironic, or playful. The expression probably comes from the idea of biting one’s tongue to suppress laughter.

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2. 

   2-25-12

   DJ Roux says:

   In the 19th century to poke your left cheek with your tongue was a secret signal to others that the speaker was being insincere or ironic.

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