Whenever an athlete (particularly a combat sports athlete) suffers a major injury and takes a long time (1 year or more) before returning to competition. Made famous by Frank Mir who shattered his femur shortly after winning the UFC Heavyweight Championship.
After tearing his ACL in October 2008, Patrick Cote had a nice Mir Layoff before coming back against Alan Belcher in May 2010.
An adjective used to describe a person that constantly smokes weed and who is content with his/her state, resenting any sort of criticism from others.
Origin unknown. I first heard it in an email thread.
Sam has been smoking weedall day and when I told him that he should stop for the day, he told me that I was being a prick. He was acting like such a mir mir!