The person you hire to do the dirty work. For a high amount of money he will follow your target and when the time is right he will launch shit at their face with no traces leading back to you.
Lucas "Man, I really hate this douche bag at work"
Jacob "I know a guy that can take care of that"
Lucas "Dude?! I dont wanna kill him"
Jacob "Naa bro, I got a Shitman on speed dial, your co-worker will be out of work with severe pink eye for atleast two weeks."