Definition of wetback in English:

wetback

Syllabification: wet·back
Pronunciation: /ˈwetˌbak
 
/

noun

US informal , • derogatory
  • A Mexican living in the US, especially without official authorization.
    More example sentences
    • The illegal immigrants are known colloquially as mojados or wetbacks, illegals, and pollos - Spanish for ‘chickens,’ the prey of coyotes.
    • Off and on for several years we employed a wetback, an illegal alien, who worked around the house and yard.
    • I think he's a goddamn wetback, so you may want to notify the Immigration Service.

Origin

1920s: so named from the practice of swimming the Rio Grande to reach the US.

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