なんじゃらほい

interjection

what is it?; what's this?

Casual, slightly old-fashioned or dialectal interjection expressing mild surprise or curiosity, similar to 何だこれは but with a playful tone.

• なんじゃらほい、この箱はこは？

  What's this box?

• なんじゃらほい、急きゅうに呼よび出だして。

  What's up, calling me out of the blue?