interjection
A casual exclamation of sudden pain, similar to 'ouch' or 'ow' in English. Often used when bumping into something or experiencing a sharp, unexpected pain.
あいたた！足をぶつけちゃった。
Ouch! I bumped my foot.
あいたたた、この傷はしみるなあ。
Ow ow ow, this cut really stings.