One of the mysteries of the English language finally explained.
Behaviour regarded as characteristic of a black man who is considered to be excessively obedient or servile to whites, or a person resembling such a man, especially (in later use) betrayal of one's cultural or social allegiance. Formerly also: †a system of slavery (obsolete).
Mid 19th century; earliest use found in Journal of the Society of Arts. From Uncle Tom + -ery.
Uncle Tommery/ˌʌŋkl ˈtɒməri/
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