Earlier quoted context omitted.
Once you've put it out there though, you can't really take it back.
You don't have to release it to the WORLD when you put it on a forum. For example, if it's web based, you can whitelist usernames/IPs. If it's a downloadable app, you can make it self destruct after a period of time or something so that people can't keep playing it.
Or start off with a codename if you've a name you're especially enamoured with and switch to the preferred name when you're starting to feel happy with it.