Green’s Dictionary of Slang

1. (Aus.) a successful person.

1904

Sun. Times (Perth) 26 June 4/8: They call this push the ‘cornfeds,’ and they bulge like brewery vats / And they’re big dogs with the donahs.

2. (US) a country person.

1903		Goodwin’s Wkly (Salt Lake City, UT) 3 Oct. 9/1: Was anyone ever cursed with such a bunch of frozen cornfeds?
1916		in E.J. O’Brien Best Stories of 1916 265: Say, ain’t these corn-feds a nice bunch?
c.1935		‘Mae West in “The Hip Flipper”’ [comic strip] in B. Adelman Tijuana Bibles (1997) 98: Our little corn-fed is embarked on her glamorous career.
1942		Berrey & Van den Bark Amer. Thes. Sl. §391.3: rustic, bumpkin, corn-fed.