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Originally a nick name for Mexicans greaser, beaner, pepper belly, either legally or illegally in the country. Originated in the American Southwest border states, Texas, New Mexico, Arizona, and California. Through common usage has come to mean citizens of any nation who have immigrated here illegally.
Most wet backs sure are hard working, cheap laborers.
by Gregory B July 04, 2006
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A derogatory word used to describe Mexicans who illegally enter the United States through the Texas portion of the Rio Grande. By going under the border fence but over the river they would wet their backs.
That guy is soaking wet and looking a little out of place must be a Wet-Back.
by Disgruntled bean December 15, 2009
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"Wetback is a derogatory term used to describe Mexicans who have immigrated illegally to the United States by swimming or wading across the Rio Grande--the river that separates the U.S. from Mexico. U.S. Border Patrol began using the word in 1944 to refer to illegal Mexican immigrants who were easily identifiable by their wet clothing.
In 1954, the U.S. Immigration and Naturalization Service made the word "wetback" official by naming the mission to remove illegal immigrants from the United States, Operation Wetback . In response to the increase of immigrants during the early 1950s, the agency developed the program to force immigrants (particularly Mexicans) back to their home countries. Aproximately one million Mexican Americans were deported in one year.

Today the term "wetback" is often used to express animosity towards Central American or Latin American immigrants--legal and illegal--who do not speak English. Meanwhile, in an attempt to reclaim the word, some Mexican-Americans call themselves Los Mojados, meaning "the wet ones."

~ This definition courtsey of www.gurl.com
Ted : Damn wetback !

Ed : Take it easy, man. He came over here as a baby on his mother's back. It's not his fault.
by Former President Richard Nixon January 12, 2006
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Illegal immigrants from Mexico who try to swim/ferry through the river illegally. They're the ones that make all hispanics look like idiots.
by Anonymous September 25, 2003
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A derogitory term used to describe illegal immigrants from Mexico. This originates from them jumping the boat and swimming to shore (undetected) hence having 'wet backs'.
"Those lousy wet backs never do any work"

"Damn Robin's a filthy wet back!
....yeah so's Dolly man"

"That guy's a bit too wet back for my liking"
by Dimma July 26, 2006
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