I saw the phrase used on deviantart and loved it.
Cho Chang was jealous of Hermione's relationship with Harry Potter when she was going out with him and challenged her to a "Mugglefight". Rules are simple remove your witches gowns, put down your wands and fight with nothing but your bare hands. Hermione told her she was being a "stupid Ravenclaw bitch" but accepted the fight challenge as she had no intention of ever letting Harry see her as second best. Cho wanted to hurt her and a strong knee to the pussy hit its mark.