Quote Originally Posted by sperk
I don't know the source or context of this but it sounds like someone imitating a stereotypical uneducated southerner's speech.
I would add that if you're going to prefix a progressive verb form with a-, it's почти обязательно to drop the -g at the end!

"Plan Number 6 is where we come a-ridin' into town, a-whompin' an' a-stompin' ever' last livin' thing that moves within a' inch of its life..."
(from the Western-parody Blazing Saddles)
"On a sunny day
In the month of May
A hobo came a-hikin'..."
(from the folk song "Big Rock Candy Mountain")