A person of a low social status. You can tell they are low class by the way they talk, what they talk about and the lifestyle they lead.
A low class loser will usually be poor, talk about trivial things and act immaturely. They also will have no goals or interest in bettering their lives.
A person you hate intensely not because they deserve such hatred but because they serve as a focus for your general hatred. A healthy way to dispense with excess animosity.
Jake's not really that big an asshole. He just serves as my hate sink.