Top Definition
A day on which you are allowed to break your diet, 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. The "cheat" can be small (e.g. a chocolate muffin with lunch), large (e.g. a fast food meal), or systemic (e.g. Full Fat Friday).
Carol: Oh my god, Jenny! I can't believe you're eating cheese!
Jenny: It's ok, Carol. Today is my cheat day.
by Matti Matti Matti January 05, 2014
2 more definitions
1 Word related to Cheatday
April 18th, the only day we know The Cheat wasn't born on.
Every Cheatday, Teh C. answers e-mail for Strong Bad.
by G.L. July 09, 2004
A set day for completely and utterly fucking up on purpose all past progress made on your sad effort of dieting.
Girl 1: HOW THE FUCK ARE YOU EATING ALL THAT SHIT I THOUGHT YOU WERE ON A DIET?!?!
Girl 2: shhhhh...you see nothing...it's my cheat day.
by Bananamanagram January 17, 2015

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