[mrngm]

Find out their frame of reference, look for comparable concepts in the real world. For technical debt, this scene from Malcolm in the Middle (S03E06) https://www.youtube.com/watch?v=AbSehcT19u0 might be a good comparison.

If you refuse to explain relevant concepts to your PM, as a neighbouring commentor suggests, that increases the knowledge gap between you (or your team) and the PM. I think it's in the best interest of both the team and the PM that they have a shared understanding of what happens within a project. On the other hand, if the PM is not interested in any of those details, that is a sign that they might not be a good fit in that part of the organisation.