Well, I don't know. I think it means that there can be menace in it, in that it's sort bad-faith use of language, suggesting action comes next. I think part of the point of profanity as an idiom is that it provides one-size-fits all terms for occasions when the idea is that the speaker doesn't see any point in being acurate or specific. It seems to say There's no point discussing it. I was interested in a discussion of whether and why and how to use profanity in writing, on another forum, and Mamet's American Buffalo seemed to me a good example of how it was one corrosive element in the sad and tenuous relationships, leading to violence. I may surf old threads about it here, about what profanity means and all. More thoughtful minds here, generally.
   But I've wondered whether phrases like Bite me, or Nailed, which seem recent to me, evolved as t.v. censor substitutes for older terms, and have now become generally accepted.