Reserved Name?

[DJ Pu$$yface]

I'm trying to change my name back to my old one, DJ Pussyface, but it said the first part of the second word was reserved. What does this mean, and can I change it?

[Space Sweeper]

I think it just means that it is very common within Predator.
Since it is one of their names.

This must be somewhat new, because there are still people with names like, er, Corporal Hicks. 

[Hive Tyrant]

Or the rules changed and Pussy is no longer an acceptable part of a username.

[AvatarIII]

i assumed that it never was hence why it was DJ P#ssyface.