Green’s Dictionary of Slang

turnover n.

[turn over (on) under turn over v.1 ]

(US) one who is seen as betraying their race, usu. black or Puerto Rican, by assimilating into or at least succeeding in the white society.

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[US](con. 1985–90) P. Bourjois In Search of Respect 170: You see someone [Puerto Rican] go downtown and get a good job [...] They turnovers. They people who wanna be white.