Bernd 06/26/2020 (Fri) 13:02:44 No.38091 del
Geocurrents has a post on this:

However he barely covers personalities and the most interesting regional personality, that of Minas Gerais. The mineiro is a discreet figure, quiet, not giving his opinion nor picking a side, never showing his wealth and power. This is because he is cautious by nature, distrustful of everyone else, introverted and independent-minded. He accumulates money but is reluctant to spend it or even let others know he has it. He is a traditionalist with a love for his past. He uses the interjection uai in more or less the same manner why is used as an interjection in English and it is possible that is an ancient Anglicism, but it is old and already considered a sacred regionalism.

First map probably underestimates the extent of Greek language use, I assume it should have a foothold in southern Italy.