It's a woman, with short bleeched blond hair, singing and dancing all alone, in a large dark room. She has 80s clothes (like funky workout attire), and the camera is following her as she dances. There are some tektonik moves in her dance.
She sings to a guy telling him what to say when he breaks up with his woman for her.
Like 'tell her you love me' or something, I don't remember the lyrics so well.