Artificial intelligent assistant

thataboy

thataboy, int. slang (chiefly U.S.).
  (ˈðætəbɔɪ)
  Also that a boy, thatta boy, etc.
  [Corruption of that's the boy (cf. that dem. pron. B. 1 b), or alteration of attaboy int.]
  An exclamation of encouragement or admiration; = attaboy int.

1936 J. Dos Passos Big Money 287 ‘All right, let's go,’ he said. ‘Thataboy,’ roared Farrell. 1975 M. Bosse Man who loved Zoos iv. 96 ‘What should I tell Hopkins?’ ‘Tell him..I'm not up a blind alley yet.’ ‘Thatta boy.’ 1978 M. Puzo Fools Die xi. 114 Frank patted me on the shoulder. ‘That a boy,’ he said.

Oxford English Dictionary

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