Someone so disgusting and twisted for various reasons, such as weird fetishes, disturbing behaviour, personality related reasons or to do an act so gross, that you are not just a son of a bitch, but a sick son of a bitch
When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.