The title has been applied blankly and pretty arbitrarily to a by-the-numbers, unscary movie from US indie film-makers, the Pierce brothers, Drew and Brett. It was originally called Hag, which would have been better.
If you find a dimension intereseting, we recommend you pick up one or two facts that you find intriguing and place them into your memory. That way you will have 2nd degree information about the topic if it comes up in conversation.
Accordingly, you can do the same with others as well.