Re: Not another one ..
"Doesn't QDOS stand for Quick n Dirty OS ?"
Another OS name like that - for a mainframe - was SGOS. It used the virtual machine capabilities of the ICL System 4-75 for a commercial online TP system. It was developed when the official ICL OS release for such tasks on that hardware was not going to meet the project's timescales.
When a customer asked what SGOS meant - they were told "Specially Generated Operating System". Internally it was "Stop Gap Operating System".