An 'imdbber' is somebody who subscribes to IMDB or is constantly online everynight about 10ish looking up new episodes of Doctor Who, looking for the new Star Trek film's sequel, hurriedly awaiting news on the reboot of Superman or else trying to get any on-the-spot-information about the next Narnia flick. Or else scanning through the fit-one-that-plays-Susan's twitter entries.
Matthew Waterhouse, desperatley waiting for a stalker to find him so he can be Adric again in a hostage situation.
Leonard Nimoy is an imdbber. Online at home about 10ish, looking up to see if anybody in Iceland doisn't know he was Spock. (And no saddos not Kerry Katona Iceland. The place Bjork is from. Gimboids.)