Green’s Dictionary of Slang

tostado n.

[Mex. tostado, a popular toasted snack composed of a deep-fried cornmeal pancake topped with a seasoned mixture of beans, mincemeat and vegetables]

(US black) a derog. term for a Latino or Chicano.

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[US]E. Folb Runnin’ Down Some Lines 55: Most of the pejoratives characterized Chicanos in terms of the foods associated with them [...] tostado, burrito.