After a brief introduction and review of recent literature on microaggressions, a theoretical typology of three sources of social injustice (oppression, dehumanization, and exploitation) contributes to the theorization of the sources of microaggressions. A selected compendium of words and affective phrases generated in classroom exercises illustrates the nature of the experience of the moment of microaggression. Future research on microaggressions as well as evaluation of practice should examine the experience of microaggression, including being subjected to microaggression, initiating such acts, and observing such acts.