I occasionally get called a "KM guru". I appreciate the compliment but I don't like the term and I don't like being labelled a guru. I usually laugh it off by objecting that I am not a "Kangaroo". Say KM guru fast enough and it sounds like KM guru. LOL.
Given this, I rather liked this blog post by Rick Ladd Dont Call Me a Guru and Peter Drucker's observation that the only reason people called him a guru was that they did not know how to spell the word "charlatan".
Oh and one other pet peeve. If you call yourself an expert then you are most likely not one. To my mind only other people can bestow that honour on you. And even then, like the word guru, I am not so sure I like it. Both words smack of elitism and marketing hype.