I chose my nickname (ScarabCoder) for these reasons.
1. "Scarab" is an Egyptian beetle, sometimes used as a God in the Egyptian times. I like it because it looks very cool.
2. Another reason I like Scarabs is that I like Egyptian things.
3. Scarabs "re-use" items, the same way I find code and "re-use" it so fit my purposes.
3. The other part of the nickname, Coder, is because I like coding.
One of the nicest things about it is that it is never taken on any social/blog/etc sites. I can use it to sign up for about anything, and it is never taken.