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A kaisoni is a girl who thinks she's the best at everything and will cuss you out if you don't agree. She's cool with her friends but will stab you in the back if you betray her.
'You're the worst friend ever!' she yelled as she threw my phone out the window.
She said she'd help me with my homework, then copied my answers.
She took the last slice of pizza and said, 'You’re not even worth the crumbs.'