The present paper explores the conceptual limitations of the bully discourses that ground UK anti-bullying policy frameworks and psychological research literatures on school bullying, suggesting they largely ignore gender, (hetero)sexuality and the social, cultural and subjective dynamics of conflict and aggression among teen-aged girls. To explore the limitations of bully discourses in practice, the paper draws on a pilot, interview-based study of girls' experiences of aggression and bullying, illustrating how friendships and conflicts among the girls are thoroughly heterosexualized, en-cultured and classed. Drawing on girls and parent interview narratives, I also trace some of the effects of bully discourses set in motion in schools to intervene into conflicts among girls. I suggest these practices miss the complexity of the dynamics at play among girls and also neglect the power relations of parenting, ethnicity, class and school choice, which can inform how, why and when bullying discourses are mobilized. (Contains 9 notes.)