Have you seen Debra Devi's book: The Language of the Blues: From Alcorub to Zuzu?
She is an excellent guitarist (her band is called Devi) and she interviewed the living blues players like BB King Albert Collins etc to create a dictionary of definitions of all those slang terms that turn up in blues songs. It's worth having on the shelf too.
Her FB page or search on Amazon
https://www.facebook.com/thelanguage...ref=ts&fref=ts