A person who has an obsession/passionate love for the movie 'Twilight' and thinks they are experts on everything Twilight, but has, in fact, never read one of the books all the way through and is probably illiterate.
Susan: OMG Rob Pattinson is so hawt as Edward he's perfect for the role and I love how he's all angsty and sexy and how Bella's so beautiful I wish I could be her and maybe Edward would drive me around in his silver hatchback!!!
Karen: It's actually a volvo, hon. You're such a twilet. *scoffs*
N: A disease of the mind where the victim suffers feelings and emotions very similar to the ones Edward Cullen experiences while dating Bella Swan. Symptoms are: Being absolutely convinced you like the other person more than they could possibly like you, Being jealous of people you usually think of as beneath you, constantly being concerned over the safety of your lover, and having a desire to drive them everywhere in your shiny silver car.
Steve was wracked with emotions he had never felt before while dating Tiffany. He couldn't focus on anything else because he was so jealous of others around her and concerned that she could never fully return the enormous emotion he felt for her. He was suffering Edward-itis.