[graaliholic]

I'm going to guess it's an insult for someone who does something stupid or doesnt know something that should have otherwise been known by them. IF they don't know, then they are a "newb". Or some people probably also use it as a level thing, since new players usually have a lower level. Another could be (as I've seen) if they are a spellcaster, especially a good one that can cause a fair amount of damage with their spells. :o