Vance Randolph addressed the topic of euphemisms in his book "Down in the Holler: A Gallery of Ozark Folk Speech" (1953, reprinted 1979). I was very interested because my mother grew up in the Ozarks, and my father, though he came from Kentucky, had speech that was quite similar.

According to Randolph, men could be very plain-spoken amongst themselves, but would be very circumspect about what words they would use in front of women. I remember he specifically mentioned hearing a man say "he-cow" for "bull"!

My parents were not that mealy-mouthed, but I don't remember ever hearing my mother use a "bad word."