According to Jeff here, there is a tag blacklist only devs can access.
Can we help selecting this tags?
Should we post a meta question tagged blacklist-request or bl-request for the team to consider?
Would this be useful at all?
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From the linked answer:
We work with the existing site moderators to determine what's bad enough to be blacklisted. It has to be quite bad.
That's pretty clear, actually. Contact the mod team and/or post here on Meta if you think something's bad enough to warrant blacklisting.
As noted in Jeff's post, the dev team actually handles the implementation. You need to convince the moderators of a site that a tag needs to be blacklisted; then they will request its addition from the dev team.