It already happens. If you look at my replaced suggestion I have a list of abused tags. My suggestion for these kind of tags is to rename tags as "character:name (series name)".

A quick glance at search results tells me that "character:cow girl" is nearly monopolized by some redhead from Goblin Slayer. This will surely lead to confusion between her and various other busty bovines. Can we clarify this somehow?

so here's the thing. I actually agree that cowgirl should only mean the monster girl type. But it's actually used very often for cow bikinis/outfits. It would take a lot of work to re-tag all of those works. So I believe we can't just change its meaning still, renaming it to "cow girl" might still help related links: describe cowgirl +102 create tag cowgirl position +56