A person who is the defined one that deals with fecal matter that comes out of a person or an animal.
The girl holding the cup in 2 Girls 1 Cup
would be the Shit Bitch
Or, "Bob, go pick up your dog's crap, it's in my lawn...Shit Bitch"
To make a stabbing motion towards your chest, directly over your heart. Named so, because it looks as though you are jerking off your heart's imaginary penis.
"I just finished watching Norbit and the Adventure of Pluto Nash, I want to kill myself." (Then proceeds with cardiomasterbation)