Mine comes from a workplace disappointment, and a friend with too much time on his hands.
At an old job I didn't get the director's position I had applied for; to try to keep me happy in my old job, my bosses told me that the new hire and I would be "peers" and offered me a new title (of course, no raise). The other guy's title was director of something, so when they asked me what I thought my new title should be, I said "director of something else". The VP, when it crossed her desk, decided I didn't deserve a director title, my bosses didn't stand up for me, and they came back to me with "online managing editor" as a potential title. Since my current title was "online editor", I was not impressed with jamming "managing" in there.
Anyway, I started bitching to my friends, and one of them found an anagram site and pointed out that there were some very cool anagrams of "managing editor".
For the first week, my favorite was "dominating rage". Once I cooled down a little, I decided that I liked another anagram better -- radiating gnome. I started refering to myself as the radiating gnome around the office.
When I quit that job but agreeded to come back to do some training classes as a consultant, I created "radiating gnome consulting" as one last way to pretend I was sticking it to them.
Anyway, it's been my handle ever since . . . . kinda sad, isn't it?
-rg