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 term used to refer to one's mental state of emotional pain. The word senti is a Latin prefix that translates to feel, and algia is a Greek suffix that translates to pain coming from one’s body.