When one's own self inadequacies lead one to be more ambitious and successful. Similar to the Napoleon Complex, which states that one of short stature may be more aggressive and domineering. It is named after Napoleon because he was of short stature, but was massively ambitious and successful, which many shorter men have to do in order to make up for their short stature.
Brett suffered from the Napoleon Complex and was bitter. His friend, Dave, had a Napoleon Incentive and decided to become more confident and funny to compensate for his height.
Chuck was planning on firing Sally until she unzipped his pants and gave him an under-the-desk incentive. She not only kept her job, she also got a raise.
A liquid bonus, typically a six-pack of the performer's choice, attached to an action, and granted after completion of the action. The action is typically crude in nature, such as having sex with someone for situational humor, or finishing a large quantity of alcohol.
Bob, Ted, Fred and Jimmy are at a bar:
Bob: "So my sister and mother are coming to visit next week"
Ted: "Beverage Incentive!"
Bob: "..."
A week later, after Jimmy successfully slays both:
Ted: "Jimmy, here's your two six packs. I'm going to put down another beverage incentive. If you finish all 12 beers in 20 minutes, I'll get you another six pack"