A Mirella
A Mirella is a girl who is super smart but doesn't know it, and then she goes on to make your life a living hell.
She said, 'I'm just average,' and then she aced my math test and made me fail.
She told me she wasn't pretty, and then I saw her in the hallway and instantly fell in love.
She said she wasn't confident, and then she stole my heart and my lunch money.