Artificial intelligent assistant

tatty-bye

tatty-bye, int.
  (tætɪbaɪ; stress variable)
  [Fanciful formation: cf. ta-ta int. and goodbye.]
  A colloquial form of farewell.

1971 A. Morice Murder in Married Life vi. 56 ‘Ta-ta for now, then.’ ‘Tatty-bye, Sandy darling.’ 1974 M. Babson Stalking Lamb xv. 113 I'll say tatty-bye for now then... And we'll see you soon. You know the way, don't you?

Oxford English Dictionary

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