What does your sig/avator/user name mean?

[ShadowX]

my name cuz i like to play in the shadows and like to sneak around my avatar for style till in can get a better one not saying that it is bad or any thing my the rest is just a blurr of nosense

[ifm2181]

My name is actually an old password. I used it since all the good names are taken, and that one is sure to be around. What're the odds that someone else would use ifm2181? Practically slim to nil.