Jail-bait refers to someone, who is often promiscuous, that is under the age of consent. JAIL BATE refers to when a prisoner sticks his penis through the bars of his cell to be jerked by a prisoner in the neighboring cell. It's when hairy palms are expected and going blind is someone elses problem.
I'm in prison for messing around with jail bait, but now earn two cigarettes a day by giving jail bate to my neighbor.
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.