If you want to know what constitutes an inappropriate username, just think about whether or not most people here would think it decent, then make your decision. I'm not a prude but I want the site to be kept on a higher level of behavior.
If you see inappropriate usernames or troublemaker post please contact me or any of my moderators or hosts and let us know. We will make a determination and take appropriate action if necessary.
I will not tolerate crude immature behavior on this site. Period!.