Another way of saying "Yea Right" to your friends in a response of disbelief. Derived from the sarcastic use of the phrase "Yeah, Ok" said really fast and loud.
Pronounced Yah-Oh-Kay
David: I'm the best gamer in my town. No one can beat me in Super Smash Brawl!
Charles: Please, my friend, Ahn, can beat you with one hand tied behind his back!
David: YAOK!
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