Top Definition
When, after a weekend of overindulgence, you have to call in fat to work to go to the gym all day.
"After demolishing a twelve pack of beer, several rum and cokes, two pizzas, and half a carton of ice cream, Susie had to call in fat to work so she could hit the stairmaster all day."
by fattyboomer August 28, 2011

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The Urban Dictionary Mug

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