In Mad Max: Fury Road, the evil boss is named "Immortan Joe". I understand that the "Joe" part comes from his original name, Joe Moore, but what's "Immortan"? Is it just a verbal gag by creator Miller, or does it actually mean anything?
Immortan = Immortal Man
From an interview with Hugh Keays-Byrne, the actor who plays Immortan Joe:
Q: What is an “Immortan?”
KEAYS-BYRNE: “Immortal Man.” So the cult, the idea: you can’t kill me. I’m here forever, and I just keep going in this mayhem that we are surrounded with. This natural world which is falling apart, I am able to control. Out of the ashes you will rise, with my help.