Using this function, images would only be black listed if the image has BOTH tags to give a little more control over the situations and types of images you see by using AND between two tags on the same line.
For example, I'm not really a fan of the realistic 3D dog bestiality content but I don't want to filter out all dog related posts or all ferals in a sexual context and it's not just one artist that does them nor do they exclusively do just that all the time. In this case, I would put "dog AND bestiality" on the black list so I would see dog posts and I would see bestiality posts (likely found on some feral X other posts that might be cute or hot) but I would not see both. I might even add "AND 3D" or something else to further narrow the filter just in case I think of a better way to filter it later.
This would affect the tag filtering function and would allow users to better refine their tastes. "AND" filters would be automatically moved below the lowest single tag to allow for script optimizing as any redundant AND tag will have already had everything related to them wiped.
Updated by Furrin Gok