In what sense is geo-arbitrage associated to Tim Ferriss for you? Genuinely curious. I've listened to a lot of his podcasts but can't recall that ever really coming up.
This isn't particular to me, but he's frequently cited for popularizing the term. You can see on Google Trends that it took off in 2007-2008 after the publication of 4HWW, and that there are virtually no results for it prior to the book's publication.