Santa's Slay (2005, Canada)
A thousand years ago, the son of Satan lost a curling contest with an angel. As a result, he had to spend the next millenium being nice and bringing gifts and all that. But now that the time is up, he's got a lot of anger to let out!
Arguably one of the better "killer Santa" movies, it keeps its humor on throughout with creative killings and witty dialogue:
Nicholas Yuleson: The clock just struck midnight at the pole. Christmas is officially over for you, Santa!
Santa Claus: You know, most people make the same mistake. The correct time at the pole is completely discretionary, because the poles are where all the time zones actually converge.
Mary "Mac" Mackenzie: He's scary, yet educational.
Not much in the way of gore, but there is a scene in a strip club with a good deal of breasts on display. It was kind of nice to see that none of the strippers were offed (on screen, at least - Santa left them when he set the place on fire, so one can imagine that they all made it out safely. He was only beating up the bouncers, anyway...)
If you've ever wanted to see a killer Santa menacing people while driving a Zamboni, this is the movie for you!