If you've ever tried to mimic the Citizens Band (CB) radio ramblings of a truck driver, maybe you've caught yourself saying phrases like "copy that," "roger," "over," or even deep cuts like "the chicken coop is clear." But do you know what all those ramblings really mean? While some trucker slang is pretty straightforward, some coded messages are less obvious.

Take the universally recognized code "10-4" for instance. No, it's not a hand position on the steering wheel (that would be 10 and 2) or an indication of what numbers the hands of a clock are pointing to. In fact, it has nothing to do with numbers at all. The commonly used code amidst truck drivers simply means, "I understand," or "affirmative," communicating to the person on the other end of the radio that their message has been re

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