哎呀我不知道啦。

Oh, I don't know.

Source: Tatoeba

Sentence Composition

1 哎呀 āiyā interjection of wonder, shock or admiration
2 我不知道 wǒbùzhīdào I don't know.
=3 啦 lā
  1. (onom.) sound of singing, cheering etc
  2. (phonetic)
  3. (dialect) to chat
=3 啦 la
  1. sentence-final particle, contraction of 了啊, indicating exclamation
  2. particle placed after each item in a list of examples