corn-cracker

noun2

1. •
   (US, old-fashioned) An agricultural machine for cracking corn kernels.

   • A subscriber at Burnsville inquires for a corn cracker which he can work by attaching it to Warren's horse power. There is a corn cracker made here, but it is not a very superior machine. — 1847
2. •
   (offensive, old-fashioned) A lower-class white person in the Southern United States.