Top Definition
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!"

by Brian Witham & Jess Witham April 18, 2008
5 Words related to Gyoo

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