If you're relating a personal experience, "I once met a seriously hot girl...", sure. That's not quite what the OP said, though. Again, imagine you're speaking

If you're relating a personal experience, "I once met a seriously hot girl...", sure. That's not quite what the OP said, though. Again, imagine you're speaking in person with a (straight) woman. You might tell a story about when you met a hot girl (assuming this is a personal conversation where that sort of story would be appropriate). But would you ever ask your friend if she had ever met a hot girl but then lost interest? It just doesn't make sense as a question in this context.