In cars, it means "make 4", so the fourth generation. Google shows the Volkswagen Golf Mk4 as first option, but I've seen "mk2" and higher used on other car brands too.
So maybe it's his fourth reincarnation
I read it Milton Keynes LOL. It's like the first 3 character of a UK post code.So maybe it's his fourth reincarnation
Some of the names I can remember right now are:
Potato Chips, ~DefaultTrust,