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 6, 2014
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The one day of the week when people dieting can eat whatever they please
Sara : Oh Jake you cock is so strong! Uh! Uh! Uh! Uh! Uh!
Jake : Yeah and your pussy is so soft! Ahhh! Ahhh! Ahhh!
Kiersten : Hey Jake I brought us some goodies since it's Cheat Day! OH MY GOD WHAT THE FUCK ARE YOU DOING!
Jake : You said Sunday was Cheat Day so I thought we could fuck other people!
Kiersten : You DUMBASS we can cheat on our diet not each other GOD DAMNT!
Sara : Oh Jake I'm CUMMING I'm CUMMING!
Jake : Ohhh! It feels so good in there!
Kiersten : JAKE GET YOUR DICK OUT OF HER NOW!
Jake : But it's Cheat Day!
Kiersten : That's It today is BEAT DAY cause I'm gonna beat the shit out of you two!
by SlopNChop March 11, 2018
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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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The day where your allowed to cheat on anything
“Why are you cheating on the test?”

“It’s nov 9 national cheat day !”
by Akeihrabb November 9, 2019
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U may cheat with a handsome guy named Dawson on November 5th
Yes you may drive Dawson’s boat since it’s National cheat day
by BBC Lasagna November 5, 2021
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October 15th is national cheating day! Cheat on whatever or even whomever you want to! It’s ok!
Hey, i really wanna eat this burger but i’m on my diet

dude it’s october 15th, it’s national cheating day!

Bro i really wanna make out with this girl but my gf would get mad

Dude don’t worry! it’s national cheat day!
by james_beckett October 14, 2021
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Doesn't exist
Guy1: It's No Nut November Cheat Day!

Guy2: And where the fuck did you find this fake news?
by Random homo sapien November 3, 2019
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