Hellitosis: The Legend of Stankmouth
This guy has an uncanny ability to sneak, crawl, and defecate. People who don't know about him come across his home, and he starts looking for people to kill. He leaves a trail of disgusting and stinky carnage in his wake. This movie is an instant gross-out classic. Stankmouth is a crazed killer who has a unique physical condition that makes "potty mouth" come to life.