A person that has mastered the art of using his/her friends to their benefit by means of sketchy pratices IE lying or slander. Typically will even resort to turning people against each other to continue living off of said person.
Ryan - Dude!! That girl has no job or motivation she's using you for your apartment and food... Tell her ass to get a job !!
Ed - You're totally right man, what was I thinking... She's such a sketch artist !!