This word came from a Thomas Hardy story where the main character was literally hanging off the cliff at the end of the book.
I like them, it's what keep me turning from chapter to chapter and sometimes shutting a book thinking, "This story has to go on! Is there going to be another one?"
Have you read a particular story where this happened to you? The first one that comes to mind is "Twilight". I found it just after it was released and read it in the car pick up line. I finished it and thought, "Well, there has to be more Edward and Bella. She can't end it there!" Thus, I went on the Internet and was relieved to see book 2 was in the works.
I honestly can't think of any other book or movie where this happened, where I scoured the Internet to see if there was going to be a sequel. However, recently there was a TV show where I had to watch the next episode...and the next...: "Man In The High Castle" and now I have to wait! Season 1 is done and Season 2 should be out sometime this year...