Pffft you guys don't know REALLY bad Christmas movies...
1.
Santa With Muscles (1996)
How to summarize this stinker...screw it just watch the trailer as there is no way to do the amount of stupid in this movie justice with mere words. There are movies that are so bad they are good like Santa Clause vs the Martians or The Santa Clause Movie from the 1950s... Then there are movies like this which are just so bad they are just plain bad.
2.
Elf-Man (2012)
An girl makes a wish on an elf doll, and so Santa abandons one of his elves at her house (The elf is played by Wee-Man BTW). Her father is a spy movie type computer scientist who has been kidnapped and held hostage (at the farmhouse across the street...) and so she and her brother, and a butcher lady who is the scientists love interest convince the elf to save him. There are just so many *** moments in this movie, from the aforementioned location of the kidnappers secret hideout, to the kids repeatedly throwing fruitcakes at the bad guys, the mistletoe which turns into something resembling a japanese tentacle porn scene, the plan to make the girlfriend was in the shower, and the man eating fruit cake monster.... Someone was clearly high as a kite when they wrote this script.
3.
Santa Clause and the Ice Cream Bunny (1972)
Sadly I could not find a trailer for this, but the full movie is on YouTube as are part of the Rifftrax commentary.
Santa Clause gets stuck on a beach and complains about being hot. He magically summons a bunch of kids who all have exotic animals that try to pull his slay out from being stuck. (This includes a goat, an elephant, and a guy in an awful gorilla suit). Then he tells them the worst acted story of Thumbellina you can imagine. Eventually he is rescued by the Ice Cream Bunny driiving a firetruck... On the bright side it has made for a brilliant Rifftrax video commentary.
4.
The Christmas Martian (1971)
Again no trailer and the whole movie is on YouTube if you are crazy enough to look for it.
We can thank Canada for this gem. An martian (basically a guy in an overcoat and the terrible mask you see above) convinces a couple of kids to come onto his ship where he nearly drowns them with candy. The military tries to capture him. Unexplained stupid crap goes down such as him leaving then suddenly being back, captured then free with no explanations given for anything. Overall though this movie is just plain Dumb and Dull.
5.
A Christmas Story 2 (2012)
Take a Christmas Story, remove all the heart then repeat all the gags, make the father a bigger jerk, and then add some poor slapstick comedy and you get this blatant attempt to cash in on the popularity of a classic.
Others which did not quite reach my Top 5 but still deserve to be named and shamed....
Jingle All the Way 2 (Larry the Cable Guy, and has nothing at all to do with the first movie...blatant cash grab),
Christmas Vacation 2 (yet another cash grab sequel starring someone else),
Bone Alone (As the name suggest it's a home alone ripoff but with a talking dog...),
Chilly Christmas (pretty similar to Bone Alone but the dog does not talk, and there are some kids instead. Probably worse than Bone Alone actually)and
The Nutcracker 3D (Visually it was nice although the 3D seemed very tacked on unnecessary, but substance wise this is possibly the worst version of the Nutcracker ever done. I mean when Scooby-Doo, Barbie, and the Care Bears have all done a more faithful and entertaining version...and what the heck was with all the Nazi/Holocaust imagery in a movie that was billed as for families and kids of all ages? I'm also trying really hard to resist the urge to make a joke about wooden acting...dang it could not help myself.)
Saving Christmas is a Documentary so I did not count it...but it's quite possibly one of the worst things ever put to film. It was #1 on IMDBs worst list for a wrong time for a good reason. DO NOT allow yourself to be subjected to this abomination.
If we are including Christmas Specials then
Frosty Returns is a pretty lame/awful failed attempt to cash in on the original, and
Grandma Got Run-over by a Reindeer was extremely disappointing given that it was by the same person who wrote the original song.
The Star Wars Holiday Special deserves an honorable mention for having nothing to do with Christmas and barely being recognizable as Star Wars... However nothing and I mean nothing can come close to touching the pure top to bottom awfulness of
The Christmas Tree (1991). Plot, acting, animation, music, everything about this thing is just soooooo awful. (It did make for an great episode of NostalgiaCritic though...so I guess it has that gong for it?)