This work argues that, whilst institutionalized social theory persists in following a rigid canon and supporting clear divisions, the vital questions in theory are interdisciplinary. The author challenges today’s social theorists to develop and practice undisciplined theories which constantly question the limits of the canon and expose the porous character of boundaries. The work contains rigorous and original analyses of the writings of Baudrillard, Deleuze, Guattari, McLuhan, Freud and St Augustine, showing the way to credible forms of undisciplined theory. Three urgent tasks are proposed for social theory: to think and feel ambivalence; to track the circulation of anomalies in theoretical texts; and to learn from the fascination with interpretative boundlessness.