Definition of "bubba"

"Hey, bubba, is that really you? Goddamn. I haven't heard from you in a coon's age." / "Don't 'hey, bubba' me, you sonofabitch.

2007, Caitlin R. Kiernan, Low Red Moon, page 27

Will Ferrell and his creative partner, the writer and director Adam McKay, are, let’s face it, our national poets on the subject of dimwitted, bubba arrogance and the redemptive powers of failure, their poems seemingly conceived in a midnight frenzy of brilliance on the back of a bag of Doritos.

2009 February 13, Ginia Bellafante, “A Pitcher’s Life After the Third Strike”, in New York Times‎

Their subjects were not bubbas from the bayous but affluent students at the University of Michigan who had lived in the South for at least six years.

2011, Steven Pinker, The Better Angels of Our Nature, Penguin, published 2012, page 120