Does it mean "he has been going on annoyingly (like a hick from Arkansas)..."? Whast does "dropping his G's" mean?
Context:
he team-building segment at the annual company meeting of Geomagic, Ping's software firm in Research Triangle Park, N.C., is not going well. The presenter has turned out to be a disappointment. Ping hired him to discuss results of the Myers-Briggs Type Indicator personality test, which 50 of her 70 employees have recently taken, but instead the man has burned an hour rehashing tired old management-guru dogma. Moreover,
he has come on gratingly folksy, dropping his G's, making showy marks on the grease board, and concluding each point by demanding "Am I right?" in a not-quite-rhetorical fashion. Most annoyingly, he hasn't done his homework: He assumes he's the smartest person in the room, when the opposite is far more likely.
http://www.inc.com/magazine/20051201/ping-fu.html