A bureaucrat (or public servant / official, etc) who denies service, delays you, makes things difficult for or generally screws you over solely for their own pleasure / amusement / possible sexual arousal. May also result from bitterness and their being dead inside.
Man: did you get the application form?
Woman: No, he showed it to me but wouldn't hand it over, he said it had to be mailed to me.
Man: But you were right there!
Woman: I know, what a bureaucunt!