mmm

Etymology

intj

1. (onomatopoeia) An emotional expression of contentment
   Mmm, this is a tasty pie!
2. (onomatopoeia) An expression used to show thought or reflection
   Mmm, I see what you mean.
   In his final years he John Ogdon] gave an interview to an American journalist who noticed that “his handshake is a boneless fadeaway. His response to a lengthy anecdote from a close friend is likely to range from a non-committal ‘Mmmmmmm’ to a rare ‘Very interesting’.” 11 May 2014, Ivan Hewett, “Piano Man: a Life of John Ogdon by Charles Beauclerk, review: A new biography of the great British pianist whose own genius destroyed him [print version: A colossus off-key, 10 May 2014, p. R27]”, in The Daily Telegraph (Review)
3. (onomatopoeia) Used to represent an utterance that is muffled or spoken with a full mouth (also spelled "mmph").
4. (UK) Yes.
   Danny: Have you got any food? I: Mmm! As a matter of fact, got a saveloy. 1987, Withnail and I