Green’s Dictionary of Slang

corn n.2

[con v. (1)]

(US black) insincere chatter, flattery, deceit.

[US]Ade Pink Marsh (1963) 171: She’s took a lot of at co’n f’m ’em cullud boys.
[US]P.L. Dunbar Jest Of Fate (1903) 175: What do you want to give her all that co’n for? She’ll never get in.
[US]J.D. MacDonald All These Condemned (2001) 118: She would make traditional bleating sounds for you, but with that same trace of corn in her voice.
[UK]R.A. Norton Through Beatnik Eyeballs 39: Now this strike me as far from corn in any way.
[US]San Diego Sailor 1: He didn’t bother to interrupt the corn I was giving out about the weather.
[US]S. Longstreet Straw Boss (1979) 279: Spouting the same old corn about the workers.
[US]J. Stahl I, Fatty 269: In this town you’re either corn or firecrackers.