[OldPossum]

“Sneaked” is correct. “Snuck” is a Southernism.

You are correct. When I lived in Alabama I heard it all the time and it just sounds right even today. I don't hear it here in Virginia but I have doubts that this is a Southern state anymore, either.

[AnAmericanMother]

Virginia was never the Deep South, having much too close a connection with D.C. As D.C. became more powerful, Virginia was sucked into its orbit, with predictable results.

SW Virginia is still very Southern, but more Mountainy Southern (like North Georgia and Western Carolina).