Top Definition
A designated cheat day on which you are allowed to break your diet and eat full-fat (i.e. not "diet" or "lite") food, as complete abstinence is impossible for most people. It also provides a reward for the sticking to your nutrition plan over the rest of the week, on the day you are most likely to break your diet because of lower discipline.
It's Full Fat Friday: pizza and ice cream for dinner tonight!
by Matti Matti Matti January 05, 2014

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