Green’s Dictionary of Slang

Watusi n.

[racist use of Watu(t)si or Tutsi, second largest of the main ethnic groups in Rwanda and Burundi]

(US) derog. term used of an African-American.

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[US]D. Hall Dock Ellis 62: Dock surely had a Bad Attitude. Frustrated in his wish to go to a black school, called ‘Watusi’ and ‘nigger’ in the corridors [...] he cared nothing for classes.