A "Southernism" is a word or phrase found in the southern region of the United States that so flabbergasts you with its profundity or stupidity that you remember it until your dying day.

My most recent Southernism discovery was from a coworker. While explaining her daughter's likeness to her father she was quoted as saying,"She was dug outta' her daddy's ass with a grubhoe!" Now what a "grubhoe" is, I cannot say, but I'm dying to find out.