2. a rude, obnoxious, or annoying person: Two or three bozos tried to cut in ahead of the rest of us in the supermarket line.
Users marked bozos means that Akismet (the part of the code responsible for spam detection) has identified these as spammers, or you have manually set their status. They can post, however posts will be visible only to themselves – they will not realise that their posts are showing up to noone else. Useful precaution against spammers (it bothers no-one, they don’t try harder since they think they’re succeeding) and perhaps against trolls, although I haven’t tried that.
Bozo: “1” means they’re set as a bozo (generally 1 means true, 0 means false). You do need to remove it, but if that’s ineffective apply the patch and then remove again. http://bbpress.org/forums/topic/822