Top Definition
Facial spasm where the corner of the mouth hooks back; as if the lower lip had been caught on a fishing hook.

This occurs in response to receiving an odd or alarming piece of information.

Hook mouth is usually accompanied by reverse claw

"Did you hear about what happened to Cindy on the bus? She barfed!" *hook mouth*
by M.A.M and S.V.B March 22, 2007

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