This essay investigates the slang that emerged from jazz scenes during the twentieth century. A music history characterized by continual stylistic change and innovation is echoed in a corresponding ‘slanguage’ created by jazz musicians. Jazz slang permeates American culture and reflects the experience of Black musicians who created new worlds within language itself. Jazz slang has provided a venue for protesting white supremacy, exploring artistic playfulness, and expressing the energy of improvisation. This essay engages the reasons for jazz slang’s creation, scholarly and societal perceptions of the language, as well as some of the major conditions contributing to its dissemination.