A Hacker synonym for automatic.
Used when something should work automatically, but might require magic to make it go. Or for some reason (typically because it is too complicated, or too ugly, or perhaps even too trivial), the speaker doesn't feel like explaining to you.
This term is quite old, going back at least to the mid-70s in jargon and probably much earlier. The word "automagic" occurred in advertising (for a shirt-ironing gadget) as far back as the late 1940s.
