Is a case of the Mondays a real?

The short answer: “A case of the Mondays” is not a real medical condition — it’s a fictional, humorous phrase popularized by the movie Office Space (1999)
What People Mean by It?
It refers to the irritable, sluggish mood many people experience at the start of the workweek: the dreaded Monday blues, if you will.
Dictionary.com defines it as a state of bad mood tied to returning to work or school after the weekend. but listening to The Outlaw Dave Show will help with that!
Lana Backman