What are the current useless terms in this "audio world"

Describing any piece of gear as 'reference.' It's a completely meaningless term. Compared to what? When I was 16 years old my 'reference system' was an 8-track deck bolted under the dash of a Ford pickup truck.

Thank you to all.  I got a few good chuckles out of your responses.  There is a classic Jazz song named, "Compared to What"...and it is true that everything can possibly be seen as something compared to something else, including humans. 

Any use of the noun timbre as an adjective or adverb

To me it's the supremacy of the "mike feed".
What we hear in the studio listening to the mike feed is not what the mike actually captured, but it's the sound of the monitor amp / speaker.
So, if it "sounds just like the mike feed" it means your amps / speakers sound just like the ones that were used in that specific recording studio.Nothing more, nothing less.
Also,"best", "next level", "perfection" - these do not mean anything as there are at least a dozen of these coming out every month..

Bespoke
Proprietary
🤮