1) Greaser 2) Mexican 3) Mexican of a sort 4) Taco 1) Greaser 2) Peon 3) Taco 
[slur] Wetback is a derogatory term used in the United States for illegal foreigners, most commonly Mexican and Central American nationals, especially to those who have illegal immigration status in the U.S. Generally used as an ethnic slur, the term was originally coined and applied only to Mexicans who entered the U.S. state of Texas from...
Derogatory term for an illegal immigrant from Mexico who lives and works in the USA. The name derives from the traditional mode of entry - by swimming or wading across the Rio Grande River. ...
(US Currency and Slang) - Illegal immigrant to the USA, especially one who has swum across the Rio Grande from Mexico.
Wetback is American slang for an illegal immigrant from Latin America.