Blacklist tag option?

So I was thinking, since there is an option to follow tags you want to see, it would be cool if there was a blacklisting option, to filter all the stuff away you definitely don't want to see. Like even if a hentai is uploaded with one of the tags you're following, if it then contains a tag specifically blacklisted as a turn off it wouldn't show!
I know this isn't formulated very well but it's a feature that'd be very nice and useful to have in my humble opinion.
Thoughts?

There was plans for this (I think it was even implemented, but only for paying members or something) but I can't remember what happened to it