what does it mean?

It depends how they use it? If, for instance, you're female, and a male friend is calling himself rockbabysguy, then, I would have thought that was quite obvious, but if they're just using your name, without your permission, then they are up to no good. Challenge them about it, and ask why they need to do it. It could be just a tease, or it could be something worse. You need to find out.

Oh my. In as much as i wanna answér you.. Im confused with your sentences. Can you just make a clearer statement so we can understand better. Why are we talking about the opposite gender and the password. im so confused now :-) Do you mean if im a man and the woman who knows me uses my name as her password? Is that what you mean?