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Monuesday /ˌmʌnˈu zdeɪ/ noun (informal)

A playful portmanteau of Monday and Tuesday, used to describe the challenging transition when Monday is a holiday, resulting in a Tuesday that carries the double workload of both days. It highlights the feeling that the early days of the week have blended together in intensity and mood, while acknowledging the positive trade-off of a four-day workweek.

In the United States, several holidays are governed by the Uniform Monday Holiday Act, which was specifically designed to ensure workers get three-day weekends (and, by extension, the inevitable Monuesday) including: Martin Luther King Jr. Day, Washington’s Birthday (Presidents' Day), Memorial Day, Labor Day, and Columbus Day (Indigenous Peoples' Day).
"Brent walked into the office looking like he’d run a marathon, muttering that he wasn't quite prepared for the Monuesday inbox explosion."

"Scott decided to skip the morning meeting, joking that his brain was still stuck on Sunday and wasn't ready to process a high-speed Monuesday."
Monuesday by Clever-Columbus February 2, 2026
The Tuesday following a holiday Monday. Feels like Monday, but is actually a Tuesday. Can totally fuck your week up and cause you to miss meetings and piss off your friends.
I missed an appointment today because my subconscious was convinced it was Monday, when it was actually Muesday.
Muesday by niftydog January 28, 2008

montuesday 

when someone does not have school on a monday the following tuesday is a monday + a tuesday or a montuesday
the student called the tuesday following his day off a montuesday
montuesday by cchs_stud1 December 2, 2010

Case of the Muesdays 

After a holiday on Monday, going back to work on Tuesday feels like a Monday. You will have a case of the Muesdays.
I have a case of the Muesdays. I need a nap. Or a muffin.
Word of the Day on September 2, 2014
1. The day of the week that falls between Monday, and Wednesday. It is used as a replacement for Tuesday.

2. An excuse for making a stupid mistake.
1. "Oh man! its only Monsday tomorrow!"

2. person 1- "I just gave a customer change for $100 and he only gave me $20.

person 2- "Thats such a Monsday moment!"
Monsday by Mike311 December 16, 2006

MoTuesday 

A conglomeration of Monday and Tuesday to make up for Monday being a bore on Tuesday after such events as a commercial holiday landing on Monday
Happy MoTuesday!!!
Monday sucked so bad from the long holiday weekend I'm taking it back on Tuesday
MoTuesday by inkblottester#1 September 5, 2012