Green’s Dictionary of Slang

(orig. US black) a subservient, obsequious black woman.

1944		PADS 76-7818: Aunt Jane n 1 • derog Aunt Thomasina n 1 • derog.
1956		Dly Defender (Chicago) 7 Mar. 4: [headline] Boycotters won't talk to or visit ‘Aunt Tom’.
1958		Jet 31 July 30: We must rid ourselves not only of Uncle Tom, but Uncle Thomas and Aunt Thomasina.
1968		Oz 8 49/1: Are you an Auntie Tom? Yes, by Malik’s terms.
1969		C. Himes Blind Man with a Pistol (1971) 58: You ever see Madame Thomasina with a hot on for whitey.
1970		Atlantic Monthly Mar. 112: Accomodators and temporizers within the Women’s Lib movement were spoken of as Aunt Thomasinas.
1973		Sun. Post-Herald 20 May 28: Because Imogene seems to be something of an Aunt Tom in involuntary servitude, the part might draw protests from some black groups.
1984		T. Harris Exorcising Blackness 29: Many Blacks managed to salvage a bit of dignity by playing the role of Uncle Tom and Aunt Thomasina; such roles allowed them to improve their own situations.
1996		C. Page Showing My Color 100: She may find that her simplest pleas abruptly shouted down amid angry countercharges of ‘Jezebel,’ ‘Sapphire,’ ‘Aunt Jemima,’ or ‘Aunt Thomasina’.
2004		in D.S. Cobble Other Women’s Movement 193: Look who’s calling who an Aunt Tom.
2005		J. Harris Footprints in the Snow of the Moon 421: A phalanx of young women rose at the same instant in the back of the auditorium and started chanting, ‘Gina-Gina-Gina, Aunt Thomasina!’ [...] meant to signify a female Uncle Tom.