corn-cracker

[kawrn-krak-er] /ˈkɔrnˌkræk ər/
noun, Slang: Disparaging and Offensive.
1.
a contemptuous term used to refer to a member of a class of poor white people in the southern U.S.
Origin
1825-35, Americanism; corn1 + cracker
Usage note
This term is used with disparaging intent and is perceived as insulting, being similar in connotation to redneck and hillbilly. Corn-cracker originally referred to a native of Kentucky or Georgia, but has come to apply broadly to any poor white person in the South. See also cracker.