What does "Sounds too Hifi" mean???

When I use it it means: a. Not acoustically natural as the way live music sounds b. Too "electronic" sounding (tizzy or boomy sounding) c. Fatiguing to listen to for long periods of time.

Hifi music reproduction is artificial. Too hifi means the artifice is not well hidden.

I was under the impression that "Hifi" is a vestage of a GOOD descriptor, a complimentary term used in the past, if not the present. Since when did high fidelity come to mean something negative? (Perhaps I missed the backlash to the 80's during my "non-audiophile" period!).

To me too HiFi usually means that too much emphasis has been placed in creating a highly detailed (read bright & thin) upper midrange and highs to exaggerate the soundstaging effect at the expense of musicality. It could also be over/under emphasis in any part of the musical spectrum to appeal to certain listeners, which departs from a neutral presentation of the contents of the recordings.

"Sounds too Hifi" mean the system don't sound like the real thing at all.
Or it is a polite description that mean the system sounds like SHXX !!!
If a system "sounds too Hifi", it always remind you that you are listening to reproduce music.