
Not an essential word if you the listener have context! It’s just that understanding this phrase is reliant on reader knowing context (i…e either that buffalo tend to buffalo buffalo OR just the theory/gimmick of the sentence itself.)
Also i believe OP made some effort to indicate via Capitalisation that one repeated buffalo is a proper noun. (Place name)
See: Buffalo(pl) buffalo(an) Buffalo(pl) buffalo(an) buffalo(vrb), buffalo(vrb) Buffalo(pl) buffalo(an)
pl: place, an: animal, vrb: verb.






Nope, that makes perfect sense to me without which that or who.
“Washington cats florida rats chase annoy vegas whores”
It’s a question of where you put pauses and intonation, when sounding it out in your head (or to another person). If you read it monotone it makes little sense. Unfortunately, knowing how its said requires deciphering it first. A lot of english novels have stuff like this, you’ll probably find - you have to read sentences twice to understand what it means