A male/female who relentlessly looks for any kind of poop. They then place it in a plastic lunch bag, heats it up in microwave for 2 minutes, and whipes it on an opponents back.
Tom : Woah man, you have a giant shit skidmark across the back of your sweater again
Mike: I swear, i didn't shit on my sweater this time.
Tom: i dont belive you, after you shat on my pillow
Mike: This must be the works of a "Sherlock Shitter"