A fork of Rural Dictionary
1) The day before work day. 2) The day people start thinking about work.
Bob- "Are you almost done with your project?" Bob- "Cause, there's a crazy party at Tom's place on Saturday." Tim- "Pretty much done, won't have to worry about it till first monday. I'll be there."
The first Monday of December when it is acceptable to start playing Christmas music
Sam: why did Tommy get beat? Jim: oh, he played Christmas music before the first Monday