On: A History of the Sentence "Buffalo buffalo buffalo...

[SilasX]

American here. Never heard anyone use “buffalo” as a verb either outside of this puzzle.

“Police police” (as well as extensions) is reasonable enough:

“Internal Affairs is like the police police.”

“So are their supervisors like, the police police police?”

[code_duck → SilasX]

It has a valid usage that’s somewhat archaic. I’ve run into the term in literature and old TV.