cheat day 

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.

cheat day by Matti Matti Matti January 5, 2014

Cheat Day 

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!

Cheat Day by SlopNChop March 12, 2018

Cheat Day 

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.

Cheat Day by Bananamanagram January 17, 2015

No Nut November Cheat Day 

Doesn't exist

Guy1: It's No Nut November Cheat Day!

Guy2: And where the fuck did you find this fake news?

No Nut November Cheat Day by Random homo sapien November 3, 2019

National cheat day

The day where your allowed to cheat on anything

“Why are you cheating on the test?”

“It’s nov 9 national cheat day !”

National cheat day by Akeihrabb November 8, 2019

No Nut November Cheat Day 

On November 13, it a day where us men can take a break from our fast and release our children.

Man: Hey babe let’s have intercourse, it’s the 13th
Woman: But it’s NNN
Man: Its fine it’s No Nut November Cheat Day

No Nut November Cheat Day by whostillsaysdoodoo November 2, 2019

National cheat day

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

National cheat day by BBC Lasagna November 4, 2021