An illness that affects metal workers and welders. Named because you build a tolerance but the weekend break allows you to be susceptible to the metal fumes again. So it is most commonly felt on monday. Also known as metal fume fever
I got Monday fever from welding earlier and now I got the shakes.
A hardo is a person who tries extremely hard at everything. Most times a hardo will try very hard at things that do not require excessive effort. For example, sports practices, gym class, etc.
Wow did you see Jack at practice today? What a hardo!