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What Does It Mean When Someone Says 10 4 Rubber Ducky?

10-4 is an affirmative signal: it means “OK.” The ten-codes are credited to Illinois State Police Communications Director Charles Hopper who created them between 1937–40 for use in radio communications among cops. Chase’s Calendar. @ChasesCalendar. What is rubber ducky slang for? Have you ever had a eureka moment while explaining something to someone? That’s what …

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