When my uncle returned from a walk uptown, and was asked where he had been, would respond, "To see a man about a dog." I'm quite sure he meant "not your business" and not that he had been to the facility.

My mother didn't use "ugly" words and her only colorful expression was an exasperated "great gobs of blue mud!"

My favorite expressions from the area where I now live are:

That stinks like c'yarn (carrion) in the road.

and

He's actin' plumb black guardish. This is from people whose ancestors arrived generations ago, and they have no clue about the "black guard" reference.