Artificial intelligent assistant

mum-mumble

mum-mumble
  (mʌmˈmʌmb(ə)l)
  Onomatopœic variant of mumble v., perhaps under the influence of mum v.

1917 R. Graves Fairies & Fusiliers 75 From which the ancient poet was mum-mumbling A song about some Lovers at a Fair. 1956 H. Gold Man who was not with It (1965) xxxi. 292 This was our first fret-fingered, mum-mumbling babe.

Oxford English Dictionary

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