gnarthritis 

Inflammation of a joint usually characterized by swelling, pain, and restriction of motion due to being to damn gnarly.

Man I have been skiing so hard today I think I am developing gnarthritis

gnarthritis by buttz January 2, 2008

GHarthritis 

Arthritis caused by excessive Guitar Hero playing.

Pronounciation: garth-right-is

Man, I played Guitar Hero for 10 hours yesterday! Now I can't even hold a pen because of this damn GHarthritis...

GHarthritis by fnordfjord September 22, 2009