Hmm, I don't see how semicolons work in this sentence.

Marking up the sentence with extras to help visualize:

Buffalo-buffalo (who) Buffalo-buffalo (do) buffalo (in return also) buffalo (the other) Buffalo-buffalo.

A sentence of similar structure, subbing components for others of the same language parts...

• Buffalo buffalo → other nouns qualified by adjectives
  • Foreign cars
  • Austin techbros
  • big money
• buffalo (verb) → other verbs
  • covet
  • cost

... would be:

Foreign cars Austin techbros covet cost big money.

(edit: I couldn't quickly think of a location adjective for the last noun, which would have stuck to the pattern more closely, but "big" is still the same role, an adjective.)