Either someone you live with or a guest in your shared house that regularly and consistently steals everyone elses essentials - like bread, milk, toothpaste, toilet paper, shampoo etc, without ever re-paying or replacing.
Steve: Hey d'ya mind if my buddy Craig comes to stay a while?
Greg: No way man. Last time that guy stayed it cost me a fortune, he's a friggin' sential thief!
(a) describing someone who is lazy
(b) someone who is a poohface
(c) the crabbiest person in the entire world (d) a person that HATES Louisiana State University