Automatically, but in a way that, 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.
adv. Something that happens automatically, but that also has some mysterious, "magical" element to it. "Smart" appliances, features, etc. that do intelligent things with less help than you might expect.
This factualizes anything you say. This is often used in an argument between friends when one knows they have lost the argument to make them automatically win. It is commonly used by a poor sport or sore loser to gain an upper hand.
It's mainly used as an inside joke/game between friends who understand the meaning of the phrase and who are willing to abide by it to continue the joke.
In a sense it is as the jedi mind trick.
mom: "I told you to take out the garbage 3 times now and it's still here."