1947 (n.), from Mex.Sp. dialectal pronunciation of Mexicano "Mexican," with loss of initial unaccented syllable. Probably infl. by Sp. chico "boy," also used as a nickname. The adj. is first attested 1967.
Mexican-Americans; short for the Spanish word mexicanos, which is sometimes pronounced mechicanos. In recent years, Latino and Latina have become more widely used to describe Hispanic-Americans in general.