哎呦

āiyōu
  1. (interjection of surprise, pain, annoyance etc)
  2. Oh my!
  3. Uh-oh!
  4. Ah!
  5. Ouch!

CEDICT

Entry Composition

1 哎 āi
  1. hey!
  2. (interjection used to attract attention or to express surprise or disapprobation)
2 呦 yōu
  1. Oh! (exclamation of dismay etc)
  2. used in 呦呦 yōuyōu