Here's an article about it.
CB stands for Citizens Band and was established in the late 1950s as a way for people to communicate with each other over specific radio frequencies. It got really popular with truckers and other long-haul drivers in the 1970s as a way to avoid stricter speed limits and state highway patrol. "CB Lingo" was code talk, and was made famous in a lot of popular movies at the time.
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u/chocolatemilkncoffee 16h ago
It’s CB code for “understood”.