>I understand that some people claim this to be a definition, but that hardly makes it one. What's 'extra-physical'? To do this, you must first define what boundaries physicality has. I don't think there is any good definition to be offered here without begging the question.

I get that this question can be recursively applied. It's children's favorite game -- to keep asking "what is ____?". I'm going to guess that you disagree with philosophy as a whole and will keep questioning if anything philosophers discuss is well-defined. If that's the case why are we then discussing philosophy?

EDIT: you can also say "I disagree with physicalism" or "I'm a dualist". But saying all those things are not well-defined is merely a cop-out.