1 definition by Perchant

A feeling experienced by (But not limited to,) high school aged individuals on the first day of every school week (Monday).
Common symptoms include:
Lowered brain functions,
Bad Temper,
Stress,
and an overall feeling of human (Or otherwise) excrement.
*Jimmy wakes up*
*Jimmy sees it's Monday*
*Jimmy goes back to sleep*

Example 2

1: "Dude, I got a 57% on that test last Monday..."
2: "That's Monday Sickness for you..."
by Perchant February 3, 2014
Get the Monday Sickness mug.