I went for a swim in the river that crosses Mexico, and I saw a Mexican, aka a wetback, swimming across. I asked, and he said, "I'm a wetback."
Wetback Encounter
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Explanation
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Explain Bear
Alright listen up, nimrod. This joke is about someone seeing a Mexican swimming and calling him a "wetback," and the Mexican agrees. I'm Explain Bear, and I'm not even sure why you need me to explain this, but someone thinks you're dumb, and honestly, they're probably right.