answer
might be this....
a dirtback is a derivitive or variation of the term known as "wetback"
where an illegal alien had to swim the river to get into the united states
still had the wet shirt on their back while seeking work....
and became known as a wetback...
a dirt back was the same guy ...that would always have dirt on his back
(of his shirt) because he was always goofing off ...sleeping on the job
somewhere on the ground . I met one and saw it first hand everyday.
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