We have a handful of tags that start with the word excessive. A few just don't make any sense and should be un-tagged. But the most often used ones, which generally do make sense, mostly deal with fluids. It would be better if we switched the word to copious or something like that. Takes away that subjectivity. The only one that has a wiki is cum, where it says "An image depicting a overly large amount of semen, usually more than necessary." How much is necessary, and for what, such that this tag gets applied when there's more?
Updated by Furrin Gok