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(n) a day where you feel fat. its not your period...its not that mcflurry and vodka you mixed together last night, its just a fat...day..

-you feel like an oompah loompah trapped inside of the Pepperidge Farm. but its okay, cuz everyone has them.

-just grab a pair of sweats and one of those t-shirts you

you got for free at your soccer camp...and lets rock

these rolls, baby!
Amelita "eww..whats she wearing?"

Carlos "her sweats and a soccer shirt!"
Amelita "ohhh...."
(together) "FAT DAY!!! WOOOHOOO!!!"
Fat Day by loompadydoompah March 8, 2010
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A day of the week/month in which you deside you will eat whatever you want, usually including your friends in it.
When we get to the cinema, we're having a fat day! We'll buy huge popcorn packs and tons of jellies!
Fat Day by NightOwl5 January 20, 2014
1. The act of taking a random day off from school and using your weight and/or size as your excuse.
2. The act of taking a day off of gym class due to the activity or just pure laziness due to your morbid obesity.
Hey man, we're running in gym today. I think I'll take a fat day.
Fat Day by x Ant e Dote November 14, 2003
When a day is so bad you cant even comprehend it. Typically fat days occur when you are at your lowest point in life and can’t continue on.
“I honestly might kill myself, today was such a fucking fat day.”
Fat day by Puffsultrasoft June 30, 2022

Friday Fat Day 

The last day of the business/school week, otherwise know as Friday, is a day where all may indulge in "fatty" foods without remorse of keeping a diet. It may also be looked upon as a day to look forward to relax, and release one's stress by eating "fatty foods".
Sadie: OMG I'm so stressed. I wish I could eat a whole tub of Ice Cream

Priya: Wait what day is it?

Sadie: Friday?

All: OMG FRIDAY FAT DAY!

*Both go and indulge in cookies n' cream ice cream*
Friday Fat Day by swagman123 December 18, 2011

International fat day 

13th October every year where all the fat asses are called out. You know who u guys are.
Hey ur fat af
That’s mean
Doesn’t matter it’s international fat day
International fat day by Wweerr October 13, 2021

National slap a fat person day 

on december 5th you can slap any fat person you want no matter what they say
Yo it’s december 5th let’s go slap Jaden it’s national slap a fat person day !