Good heavens, language hat is a person? I'd had the idea the name was a web site!
Anyway--I've known about dasn't for just about all my life, I reckon. I was thinking it was in one of the Uncle Remus stories, and it may be, but all I felt like trying to look up was The Tar Baby, and it's not in there.
I did find a link with what is probably the original spellings; some of you may enjoy trying to decipher what is being said.
The Tar-Baby