Right, good classification. From the slides:
Does the target feel oppressed, humiliated, de-energized or belittled?
Does the asshole target those less powerful?
Everyone has a bad day sometimes. For assholes, every day is a bad day
Seems like your second definition, "someone who wants to play power and status games" is the closest.
http://blip.tv/tech-love-live/osb09-donnie-berkholz-assholes-are-killing-your-project-2464449
This is specifically about why it's important to get assholes out of open source projects, but it applies in general. It includes an analysis of the social cost of keeping people around who frequently make other people unhappy, and in particular a way to balance the social costs (distraction, people doing much less work or leaving, useful volunteers not joining, assholes recruiting other assholes, etc.) of assholes against the useful work some of them do.