I asked Schott about his chart, and he responded via email:
The coffee lingo piece was great fun to research, though it was – as these things are – labor intensive.
The words were collected by emailing and calling dozens and dozens of independent coffee shops all across America. Perhaps the only thing that surprised me was the number of establishments who never got back to me. But those that did supplied some delightful gems.
You might know this, but this Op-Chart was the latest in an informal series I am working on about "private languages" – See also: Battle of the Somm / A Fashion Week Miscellany / Terms of Service. There are more in the works.
From his piece: