A blacklist is a list that you have which, by default, is blank. You can add tags to the blacklist, as many as you want. What this will end up doing is, as you search posts, it will automatically hide the images that contain that tag.

This may result in some pages appearing to have less images in it than other pages, or in the case of some popular tags, may hide a page entirely.

Do be careful when adding tags to the blacklist. If what you typed is misspelled, then it will not filter out the tags effectively.

Here are some link to additional information you can find about blacklists. Bear in mind that complaining that you do not want to see a particular type of image, and not editing your blacklist to filter it, is generally frowned upon.

General information
Discussion regarding usage

If you have any questions, let me know or reply here!