ギョッ

interjection

shock; startle; fright

An exclamation of sudden surprise or alarm, often at something startling or unexpected. Used in manga and casual speech.

• 暗くら闇やみから猫ねこが飛とび出だしてきて、ギョッとした。

  A cat jumped out of the darkness and I was startled.

• ギョッ！ こんなところに蛇へびがいる！

  Yikes! There's a snake here!