Definitions by Brian Witham & Jess Witham

Gyoo 

Fast way of saying fuck you. Usually used by a person when he/she is contradicted or proven wrong.

Person #1: "Hey, did you know the sky is green?"
Person #2: "No it's not. It's blue."
Person #1: "...Gyoo!"

Gyoo by Brian Witham & Jess Witham April 18, 2008