by kristenka0s December 9, 2008

Something that is super extra awesome. This awesomeness even goes beyond gnarly. Both silly and sick are adjectives in this phrase, so you know it means buisness.
by Elib November 11, 2006

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.
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..."
*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

when your undershirt is not properly fitted
when someone pulls on your shirt
"Man you got sick neck! fix ya shirt peepz."
when someone pulls on your shirt
"Man you got sick neck! fix ya shirt peepz."
by c-jizzle316 August 17, 2008

by Yhyh April 30, 2019

by callum mcewan October 17, 2008
