What does "Sounds too Hifi" mean???


Lately I've been reading this phrase on various forums, and have no idea what they are talking about. What is the "hifi" sound? What does it mean when something "sounds too hifi"? Does that mean it doesn't dissappear, that you are aware that the music is being made by "equipment"? Is this term in the audio glossary?!!!
peter_s
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!).