Everybody's favourite asshole. This is the type of person who makes sure that THEY are the ones who get to do every last crossword in the sunday papers, even if YOU bought the damn paper yourself. Can be widened in meaning to encompass anybody who has a tendency to make sure they get all the enjoyment out of something which is quite trivial, yet in principle is still quite important.
"Christ's sake Billy, you've already popped all the little bubbles of air in this entire roll of bubble wrap. I wanted to do some! You're such a crossword nazi!"
"Gott in Himmel! Ich bin ein Berlinner!"
"What the fuck have donuts got to do with anything, foo?"