Definition of daddy-o in English:

daddy-o

noun

informal
  • 1Daddy.

  • 2Specifically. Originally in the speech of jazz musicians and associated circles: used as a general form of address, especially between men, to indicate familiarity, amicability, or equality between the speaker and the person addressed. Compare "daddy". Now dated, and chiefly in ironic or humorous use.

Origin

Early 20th century; earliest use found in School Journal. From daddy + -o.

Pronunciation

daddy-o

/ˈdadɪəʊ/