Ok, I'll throw down.
I'm a little fan of mythology (not specifically ancient Egypt) and Sci-Fi, so when I started gaming I used Anubis. When the community got bigger than just friends it was harder and harder to use it so I went through a couple of variations and thought this one was the most appropriate. I’ve even wrote a short essay for Mythology on what it means to me.
Master has a few meanings for me on a personally level. The Master is Doctor Who's lifelong nemesis and a psychopath. I’m also good at a lot of things I do. So, It’s also kind of a reflection of the “jack of all trades, master of none”.
Anubis will take your heart and weight it in judgment of you. The heavy hearted go to the underworld. I wanted to facilitate passage of my enemies to hell... so Anubis seemed good. It also covers my god complex.
Having MasterAnubis is unique enough that I get it on almost everything I want to log onto, so I use it. It’s all my forum logins. Other places that are more global in usage I can usually add a 1 to it and be fine (1 = won. hehe).
Shawn