What I mean is the act of "coughing" something that you don't actually want to (or rather dare) say outright. So instead of writing, say, "Miss Parker", you'd write "*cough*Ms Parker*cough*" or fake a cough that sounds very much like "Miss Parker".
Written and spoken differ in that of course, when written is absolutely clear what that "coughed" term is, while when spoken it's "hidden" in the cough (which the written form tries to express).
Never heard it in conversation, only heard it in movies or read it in books, though my contact to actual English native-speakers is (sadly) limited.
Is there a linguistic/rhetorical term for that?