I needed a nickname for my school jersy for Year 12, and Extreme110 was really stuff, so I remembered how I had a job at McDonalds in Year 7 and how they never officially fired me, and how I was inbetween jobs at the time of deciding names.
So I came up with "McJobless", and it turns out nobody else ever used it (maybe because it's ridiculously stupid or because its2original5you).