A Skye
Skye is a girl who looks good, but she can also be a real pain. She's your best friend or your worst enemy. She's loyal, but she'll fight you if you mess with her.
'Why did you fail the test? You're a Skye!'
In class: 'She started a fight over a pencil. That's a Skye.'
Friend: 'She's a Skye. She'll stand up for you, but she'll also yell at you.'