I've created tag-blacklist. I think it is useful to know which tags have been blacklisted (or blacklisting was discussed) in the history of the site. This should make finding such discussions easier.

So I also added tag to one older discussion.

Interestingly, I was not able to add it to this one. I was told that "title contains a [tag] prefix: use the tag fields to enter tags instead"

I've also created tag wiki - simply by copying it from meta.SO. But I omitted this: To suggest a tag be added to the blacklist, use [tag-blacklist-request] instead. (Since we do not have such tag.)

Although I have to admit that the tag would not pass Qiaochu's test: In other words, is this tag already a viable search term for any questions it might apply to?

But meta.SO has such tag - perhaps it might be useful here, too.