AO3 wrangles disambiguated tags to other fandoms. It takes more work to later fix a tag after it wanders than it does to change the tag when accepting it. To amuse myself I used ridiculious disambiguations for these fandoms that are prone to wandering. If it is so off the wall that it has never been used in the archive then there is no way that it could wander. Most of these share initials with the fandom, make a reference to the fandom, or otherwise amuse me. In this case "Super Vacation Ultra" has the initials SVU.