Definition of oh-my in English:

oh-my

verb

rare
  • no object To exclaim ‘oh, my!’.

Origin

Late 19th century; earliest use found in Sabine Baring-Gould (1834–1924), Church of England clergyman, author, and folksong collector. From oh, my!.

Pronunciation

oh-my

/ˌəʊˈmʌɪ/