Dago is a UK ethnic slur for people of Hispanic, Italian or Portuguese descent, used specifically in the US and Australia for Italians.
I can understand your frustration with Adam. I think having him around can be a good thing though. He adds more activity due to the likelihood of people challenging his opinion and his knowledge. I can't see why the ignore button wouldn't suffice. Obviously I would choose having monkeystyle over a lot of people to be here, I just don't feel it is necessary to ban some one with out good cause. Especially when more often than not his posts usually create some sort of response out of people, whether negative or not.