"The Mean One" is described as a horror parody of Dr. Seuss' classic Christmas story.

Not long ago, we got our first look at Winnie the Pooh and Piglet as sadistic psychopaths in the upcoming horror film "Winnie the Pooh: Blood and Honey."
 
Now it's time for the next child favorite to walk the same path, and become a brutal killer. The Grinch, the green creature who hates Christmas, is the main character in a new slasher film released just in time for Christmas. Here he torments the small community of Newville, where a young woman is trying to process the murder of her parents 20 years earlier.

The film goes under the title "The Mean One" and is described by Bloody Disgusting as a total reinterpretation and a wild parody of the classic story, but with more violence and slaughter.
 
We have previously seen Jim Carrey make the grumpy role in a Christmas movie from the year 2000, and a few years ago Benedict Cumberbatch lent his voice to an animated "Grinchen". The new film stars David Howard Thornton, whose main IMDB credits seem to be the b-horror movies "Terrifier" 1 and 2.