mm-mm.

n.  a double hum to fill a pause while thinking; see also mm.

<“Hang on a sec,” he said.  “Back up.  Mm-mm: ordeal.  Someone’s got an ordeal waiting for them.”  —Neil Gaiman, Neverwhere.>

mmf.

n.  the chewing sound of a “white, orange-spotted wildcat” ravenously scarfing down a pawful of cookies (Voy.com).

mmf-mmf.

n.  the sound of someone’s muffled voice from behind a large piece of fruit.

<He barely hesitated on the third picture, a repro of the Magritte of a man with an apple obscuring his face.  “He’s trying to talk but the fruit muffles him.  All that comes out are these ‘mmf-mmf’ sounds.”  —Pat Cadigan, Mindplayers.>

mmffh.

n.  an incoherent mumble, as when one’s face has been taken over by nano-bots, in the comic strip “Superosity” by Chris Crosby.

mmgh.

n.  a slurping sound from a full mouth; a muffled sound made during sex.

<“Al,” I said.  “Mmgh?”  “C’mere,” I said, tugging slightly at his armpits.  —John Fox, The Boys on the Rock.>

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