Top Definition
The weight one gains prior to Christmas when they jump off the diet track, usually followed by an overindulgence on Christmas day.
Person A - "Fuck! When did I get so fat?!"

Person B - "You've always been that fat."
Person A - "Shut the fuck up, it's just Christmas weight. It'll go away in a week or two."
by Barry and Wallace. December 29, 2009
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