Hi 💞 it stands for dead dove or dead dove: do not eat!

If you dont know what that is its a tag used by fanfiction authors to warn readers about dark/problematic themes within a fanwork. Most of the times authors will use other tags along with it but not always. Basically tells you that everything tagged will appear in the fic and if you dont like it you should stay away from it.

I think it originated from a show where a character opened a bag (?) with the note "dead dove do not eat" written on it and upon realizing there indeed was a dead dove inside the bag he asked himself what he expected in the first place.

Hope that helps :)
Have a nice day 🩷