What is Aiyoo?

The Singaporean Exclamation

My players concedes a penalty and gets sent off
Me:"AIYOO!"

Aiyoo - meme gif

Aiyoo meme gif

Aiyoo - video

Aiyoo - what is it?

South African Indian slang, meaning surprised, or shocked.

Someone says... BOO!
OYO, AIYOO flip that scared me!