Your an idiot.
Posted on the internet to when someone acts foolishly or says something completely dumb.
Pronounced 'Yay' and said with enthusiasm.
Person 1: Do you know the capital of Luxembourg, in Europe?
Person 2: Wait, I thought Europe was a country...
Person 1: YAI!
Person 2: Is that like Chinese or something?
Person 1: *Facepalm*