- Name for mmm sound - English Language Usage Stack Exchange
This is an opinion (hence, the comment instead of answer), but IMO, "Mmm" is a kind of closed-lip moan that can be used to indicate something's yummy, or to fill space when trying to answer a question or an ambiguous non-committal sound when you're not quite sure what to say or if you don't want to say anything but acknowledge the other person with an audible response
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