One who is
addicted to the concept of
meta.
For example, I had a pychology professor once who was particularly metaddicted (he's the one who's indirectly responsible for the word). He would often spend a good portion of his class-time, discussing his teaching style. Well, not really discussing, but more wildly breaking out into self-commentary about it. He would say things like, "Wow, when I stand here and think that I'm thinking... it's like ... woah."