The Greasy Strangler (2016) 🔪

I think this is supposed to be a horror comedy, but I confess I could only watch 10 minutes of it.  It starts with a very weird father son relationship and I was completely grossed out after the first few minutes, although not by what you might think in a horror movie.  My disgust was in the mostly naked bodies of the father & son and the descriptions and shots of the meals.  You can take the name of the movie as literal.