gabigirl
A gabigirl is a woman who looks young, acts old, and knows everything you're thinking before you even open your mouth. She’s got your brain in a vice and your heart in a trash can.
He tried to flirt with her, and she said, 'I already knew your whole plan.'
My brother got dumped by a gabigirl for cheating on a test.
She told him, 'You're like a dummy who thinks he's smart.'