a silly question:

[s-f-w]

How do u define "mac os"?

 

[cockneygeezer]

MacOS = Macintosh Operating System

 

[plastic]

Macintosh On Service. When you buy a "lemon".

For normal folks, read above post. LOL...

Sorry, I am trying to be cheeky.

 

[scruffy]

Or, if you're irish, "son of Os"