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Casey Berard posted a snapchat about Moonday on January 17, 2022, and now this is on Urban Dictionary.
Moonday by gbabyulm16 January 17, 2022
a day in which a blonde (or claire) considers to be a full moon.
ella: "I think i'll have a party moonday"
claire: "Is that when like there's a full moon or something?"
ella and rachel: "No stupid, moonday = MONDAY"
moonday by stoneleighite November 11, 2008
A Monday that comes out exactly when the moon is full
Guys, I have good news for you. It’s Monday, and the moon is full. That makes it a Moonday.
Moonday by bluestinger66 October 27, 2022

diaz monday 

When you are so tired of work, had an awesome weekend, realize its Monday 7am; you hate your job and your manger, you decide to make up some crazy excuse not to go in.
Hi Honey it's past 9 in the morning don't you have work today? Oh hell NO, I 'm pulling a Diaz Monday!

Chest Monday 

The internationally recognised day on which to train one's chest. This is the best day of the week.
'Have you got plans this evening?'
'Are you serious?! It's chest Monday.'
Chest Monday by NandosKnight November 11, 2013

Danny Monday

Doing a Danny Monday is when you acquire something perfectly good and totally ruin it almost instantly.

This can be achieved by seizing engines, letting wiring set on fire, painting green, excessive lowering, leaving the bonnet open and driving, not putting coolant hoses on properly, painting red, being bald etc.
'That's a nice car, hope he doesn't Danny Monday it'
Danny Monday by jxc12379564 January 21, 2012