Aw, mine is dorky.
A long, long time ago, I used to run a Sailor Moon mailing list on AOL with a friend of mine. (I know. I know.) We wanted our screen names to match characters from the show, and I wanted "Tin Kitty" but it was taken (the horror!). I still wanted some form of "kitty", and I figured, I am a very quiet person, so I tagged "silent" onto it and there you have it. I've been using the name for pretty much everything intarweb-related ever since.
hahaha dork =P
/subcultured used to watch sailormoon long time ago cause he didn't have any access to other animes. and he liked the way they transform all nakedy