Mine is actually a tribute to all my old nicknames I've used over the years.
If able, it is written in full caps and a hyphen: DMET-XIX
It would be pronounced as: Dee - Met - Nine - Teen
Though most people simply call me: Dee - Met
I fully realize it will look to some as if I simply chose a random bunch of letters and I might come across as a 'lamer', it was a deliberate choice and holds special meaning to me.
Besides, I tend to post intelligently, constructively, and am generally very nice to people, so that misconception is gone once people get to know me.