Can often be a twihard, twilly or twilighter. Twinites take great pride in defending all things Twilight and related to Twilight.
A twinite often has a great knowledge of Twilight to draw on, but is not totally obsessed (unlike twihards). A twinite's greatest joy is being able to put down a twilight hater with ease, thanks to their intense twilight knowledge.
Random person: "Edward's a total stalker"
Twinite: "Not true, he's protecting Bella"
Random person (unable to think of response to this ridiculous statement)