Trimpey calls it the Beast to keep things simple. It's a novel concept for many people, and the metaphor is a useful one. The Beast isn't an illness, an evil genie, an artifact of psychological wounding, or some mysterious genetic defect - it's simply a name for our lower, or survival, drives which are hard-wired on the principle of if it feels good do it.
Carlygirl, you say the get the concept but dislike the term. OK. Call it Patrick, or French Toast, it doesn't matter. What matters is that you ignore it.