Definition of "sumbitch"

“ […] The reporter thanked him sarcastically, said he hoped the book would sell a million copies, and walked off to the bar. Scott said, 'Us binness men have to stay friendly with these small-time sumbitches, but what do you care? You just got to worry about the New York Times and Time magazine and like that.'"

1962, Herman Wouk, chapter 4, in Youngblood Hawke

He dug his bare heels into the horse's flanks and bounced up and down. He slapped her with his hat and clicked his tongue frantically. "Come on, Quicksilver, you old sumbitch! Move! Go! Go! You old sumbitch, Quicksilver! Haaaw!"

1978, Tom Reamy, Blind Voices