I think that's an old Southern saying. My Grandma who's from Oklahoma uses that in reference to my Grandpa all the time. "You're Grandpa is so thick headed I'm going to kill him and tell the Lord he's dead," kind of thing.
I had no idea that term was *Southern* kind of odd IMO, but hey Swaggart is the cousin to Jerry Lee Lewis who married his 13 yr old cousin, I think they are maybe from the:
Silver Dollar Trailer Park?