What does the phrase thish-yer mean?

"This-here" or "this-yer" is a dialectal form of "this here" or "this year". It's a way of emphasizing "this" by adding "here" or "yer" to the end. It's most commonly associated with Southern American English and other regional dialects.

Think of it like using "this" with extra emphasis.

For example:

* "This-here's the best pie I ever had!"

* "Look at this-yer beautiful sunset."

It's a colloquialism that adds a bit of color and authenticity to the speaker's language. While widely understood, it's generally best to avoid using it in formal writing or professional settings.