Pakato
Pakato is when you're so clueless, you think you're the smartest person in the room. It's like being a crumpled up wrapper in a trash can full of clean paper.
He pakato'd through the math test, thinking he was Einstein, but he got a D.
She pakato'd through the whole conversation, talking nonsense like it was normal.
He pakato'd his way through the game, making terrible moves and still thinking he was the best.