1. The head writer of the British sci-fi TV show Doctor Who. Brilliant writer who enjoys torturing the characters and playing havoc with viewers' emotions. Affectionately referred to as "The Moff."
2. An expletive used when a) strange character revelations surface, b) Rory dies - again, c) plot developments are not explained and/or left as cliffhangers.
Doctor Who is so much more convoluted since Stephen Moffat took over.
WHAT?! River Song is actually (-spoilers-) but we don't get to know what happens until next the next series?!! MOFFAT!!!!!