Is "Where do we draw the line" a slippery slope fallacy?

I've just been thinking about this a lot lately. Whenever two people are discussing something, I often hear "where do we draw the line" not necessarily as a question but it's usually implied to be a supporting argument to a previously made statement, and it feels like it's a slippery slope fallacy, but I'm not sure.

It most often seems like someone asking this is making this kind of point: "If we allow X, then that will open the doors to allow Y and even the dreaded Z, so where do we draw the line if not Y?"

I hope I explained what I mean clearly enough.

Hi Logan. This is an excellent question. Asking "where do we draw the line" is wonderful—IF the question is sincere. As you suggest in your opening question, many times this is not sincere but rather a statement that the person believes the line has already been crossed. This is a slippery slope argument. The question is, is it a legitimate slippery slope or a fallacious one? It would have to be argued based on the specific example.