Abstract Anti-Black language ideologies manifest in exclusionary language policies (e.g. Sung & Allen-Handy 2019), educational tracking (e.g. Sung 2018), and scholarly claims of Black ‘deficiency’ (Smitherman 2000). A liberal educational research tradition has countered with ethnographic accounts of cultural ‘mismatch’ (Michaels 2006) vis-à-vis Black educational ‘failure’. Conducting a textual analysis of an archive of ethnography of communication texts, I locate multiple genealogical linkages holding between ‘mismatch’ and deprivation discourses, principally ones centered on representations of ‘pathological’ Black ‘matriarchy’. Paralleling Black feminist theorizations of ‘fungible Black flesh’ (e.g. Hartman 1997), I account for these representations by conceptualizing ‘fungible Black sound’. I further argue that ‘fungible fugitivity’ (e.g. Snorton 2017), that is, how Blackness fluidly responds to white incursion is linguistically realized in acts of ‘signifyin(g)’ (e.g. Mitchell-Kernan 1999), yielding the analytic category ‘fungible(ly) fugitive Black sound’. Lastly, I reread an ethnographic text with this analytic to illustrate its affordance for (re)imagining Black futurity. (Black sound, fungibility, fugitivity, raciolinguistic ideologies, ethnography of communication, Black studies)*