That's not how language works. Words and terms have meaning, you can't just make stuff up and say "languages evolve/everything is subjective/use whatever phrase you want whenever you want."
All words and phrases are made up. None of them have an “inherent concrete meaning”. Commonly-accepted deifnitions today may have been entirely foreign a few decades ago.
When in spite of this shared language/domain situation, a phrase is gobbledygook, it is fair to say it has "no inherent concrete meaning".
I do agree that it all glarps like slofting ar a six year old.