An extremely well endowed leprechaun who hangs out in a men's bathroom, convincing men that he would grant them wishes if they allow him to fuck them in the ass, then asking how old they are, and then stating, "So you still believe in leprechauns..." is a blatant display of tomfuckery.
The end result of watching a 'last episode' of any TV serial written by Steven Moffat, owing to the impossibility, confusion and pure anger at very complex and brilliant plots. Especially when there is a sizeable gap between one episode and the next. Usually found in relation to British Television shows Sherlock and Doctor Who.
A: Did you see that episode last night? It was infuriating!
B: I know! My head's been totally moffucked!
The state of confusion after seeing a new episode of the British TV Show Doctor Who written by head writer Steven Moffat, when more questions are raised than answered. Usually occurs after an episode that ends in a cliffhanger that hints at several possible conclusions.