After pondering the question for awhile I've come to the conclusion that it doesn't offer an easy answer. With Hung being such a deep system and having many variations from different branches, regions and such. The only way to define it is by it's roots and by roots I mean the underlying principles that are found across all branches.
I guess all our interpretations are going to be different so we could also ask ourselves, how do we define Hung from our own experience and perspectives?