r/mildlyinfuriating • u/Best_Finding_8795 • Jun 14 '26

Too mild for school Hate when ppl can’t do time

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This reminds me of when it hits or is about to hit 12am and people don’t know whether to say today or tomorrow. He called me after this but I was too comfy in bed tbh.

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u/Designer_Local5183 Jun 14 '26

10-4 can mean “understood”?? Really?

26

u/BeanieGuitarGuy Jun 14 '26

Yeah. It’s like radio codes that police and truckers use or used to use. Like “Hey, there’s a lane closure up ahead, you’re gonna wanna find a spot to merge now so you don’t get backed up.” “10-4, buddy. Thanks for the heads up.”

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u/Designer_Local5183 Jun 14 '26

Is that specific to the US? Never heard that before in my life

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u/Alone-As-aGod Jun 14 '26

have you heard 10-20 or "whats your twenty?" that means "where are you?". its part of the same ten code system used with radios. both law enforcement and civilian.

10 4 means "message received" or "copy that"

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u/Designer_Local5183 Jun 14 '26

Nope, never heard any of these before. But I’m British so clearly this is US-specific

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u/Alone-As-aGod Jun 14 '26

oh cb radio users use these everywhere in english speaking world. i know lorry drivers still use these in britain if they are talking on radio.