look up any word, like wcw:
 
1.
A phrase used to describe someone that has a bad mood when he or she comes to work or school on Mondays.

OR

A phrase that someone uses if he or she wants to get their ass kicked by their fellow co-workers or school mates.
Jerk #1 - When you come to work on a Monday, has anyone ever told you, "Looks like someone's got the case of the Mondays."?

Jerk #2 - No... No man... Shit, no man... I believe you get your ass kicked for saying something like that.
by Elmer November 24, 2005
 
2.
symptoms of a useless or horrible Monday morning after returning from the weekend, used in the movie Office Space
Sounds like a case of the monday's
by alpine January 25, 2004
 
3.
when someone comes into work on a monday and they're really pissed off.
"say lawrence when you go into work on a monday and your not feeling too good does anyone ever say to you sounds like a case of the monday's?""no, no man, shit no, i reckon you'd get your ass kicked saying something like that.
by Mick July 09, 2004