In fairness to this debate, "hi fi" may indeed be hi fi, but that is not alwyays a good thing.
So it should also be said that if your system sounds really good only with weirdo audiophile recordings, it is definitely hi fi.
If you find yourself not necessarily enjoying music, but sitting in your chair with a strained, contemplative look, while worrying about the cost benefit ratio of your latest upgrade, your system is definitely hi fi.
If you find yourself marveling at "inner detail", "resolution" or "transparency" in certain recordings, your system is probably hi fi.
If you think double blind tests are not relevant or fair, your system is surely hi fi.
If during normal operation a component has failed on several occasions, or created smoke or fire by itself, in a speaker or in your house, that is also definitely hi fi.
Enjoy,