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Old people have this. When an old person continually moves their lips, mouth and/or tongue - as if they have food in their mouth, but they really don't. Someone with this condition is extremely annoying to be around.
*Old woman with Invisible Food Syndrome makes gross noises with her mouth for hours*
*Teenager leaves room so that she doesn't punch her grandmother*
by blahblahmeow April 25, 2009
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