"Linguistic whateverism" is not a recognized term in linguistics or any other field.
It's possible you've misheard or misspelled a term, or it could be a made-up phrase used in a specific context.
To help me understand what you're looking for, could you provide more information?
* What was the context in which you heard or read this phrase?
* What do you think it might mean?
* Can you give an example of how it was used?
With more information, I can help you figure out what the speaker or writer intended to convey.