Common slang for "Pig", "Boar", "Pork", or "Swine" in the US Mid-South.
Traces it's origins to an obscure religious movement from Arkansas that gained some local prominence in the late 2000's. The literal translation of the term means "the greatest of boars" and once served as a title for one of the movement's members.
"Who want's to eat some Goodie Gorn tonight?"
"I'm gonna make you squeal like Goodie Gorn!"