There are at least a few cases in which a compound word or phrase, transparently containing an obscene word, seems to be considered less obscene (in some dialect/registers/circumstances) than the word itself. The two examples on which I’m fairly sure of this are:
- clusterfuck
- bullshit
Unfortunately I have no hard references beyond my own experience here: I’ve heard people use these whom I’ve never heard swear otherwise, and heard clusterfuck on the radio in programmes where I’d be amazed to hear fuck. But I recall also seing this mentioned somewhere online — a comment on Language Log, or similar — though I can’t now track that down.
So… is this phenomenon documented? well-known? quantified? And are there other notable examples? The other potential example I can think of is motherfucker — it has I think become partially decoupled from fuck in its level of obscenity, but in the circles I know, it’s typically considered more not less obscene.
(Since I don’t have any references, I'm open to the suggestion that I’m imagining this phenomenon, over-extrapolating from a few unusual occurrences.)