Originally posted by NUKE
So in other words, unless you researched where an illegal crossed the border, and by what means, you would never be able to identify a "wetback"
That is where it "originated". I'm pretty sure you can define "originated" on your own.
The word is now used as a synonym for illegal alien, generally from Mexico.
If you want to use it as an insult, then call any Mexican a wetback. It's liable to get you punched in the face, though.
Even used properly, the term wetback is derogatory. Not many people complain about an insulted illegal alien, though.