A person obsessed with Twilight! All they can think about is Edward Cullen and how one day they will soon be married. All they do is daydream, wishing they were Bella. They've read all the books at least 5 times and their whole room is decorated with twilight characters. They have seen the movie a dozen times as well. and every day they repeat all the lines over and over again until they become part of the everyday vocabulary.
Look at the twihardigan over there!
OMG the twihardigan won't shut up about Twilight.