Neck skin that hangs over a too-tight collar.
She: You need to buy new shirts.
He: Why?
She: Your collar is so tight that you have a neck muffin.
by Momus the Sarcastic January 30, 2010
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When excess neck fat spills over the top of a dress shirt acquired more than 20 pounds ago. Related words: Muffin Top & Turkey Neck
by Marty Blackstone May 11, 2013
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