Moderation and BlackListing
bbPress uses the same moderation and blacklisting tools that WordPress uses for comments. If you’d like for Topics and Replies by your users to be subjected to additional moderation, and/or completely blocked from being posted, you can use the Comment Moderation and Comment Blacklist settings, located at:
Admin > Settings > Discussion
When a Topic or Reply is found that contains a word in your Comment Moderation settings, it will be placed in Pending status, rather than being published immediately.
When a Topic or Reply is found that contains a word in your Comment Blacklist settings, it is prevented from being posted, and the user receives a relatively generic response like:
Your topic cannot be created at this time.
The reason the response is kept generic, is so the offending user is not clued into a problem they can then attempt to circumvent with spaces, symbols, or other web voo-doo.
You cannot currently modify the results of these responses, though a core patch to the
bbp_add_error() function could enable it relatively easily in a future version of bbPress.