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If someone is kailua, they're the kind of person who thinks they're the best at everything. They surf like a boss, skate like a legend, and act like they're too good for everyone else. They say things like 'cruz' like it's the most important word in the world.
Yo, you're so kailua, I want to die.
He's kailua, and he's gonna beat you in the skate park.
She's kailua, so of course she got the last slice of pizza.