Dark comedy drama. Also a gross out and sex comedy but instead of cheap physical jokes (ok one at the end) and loud characters it has a quiet vulnerability and painful tender moments. This quiet and dramatic acting along with dialogue that's directly painful but worded simplistically and sometimes silly gives a funny effect. Obviously the subject matter isn't funny itself but the delivery is. When the jokes over it's instantly back to thinking of what happened and how screwed up these people are. It's a gripping cycle.
I like the effort this movie makes to be different in its comedy style yet didn't go they way of sacrificing realism.
The themes are pretty taboo. It definitely goes into bizarre territory.