You may or may not know this "idiom". It's actually a military phonetic alphabet code phrase which means: good job/well done ;-).
I came across to the NATO phonetic alphabet the other day (see pic below). It is the most widely used set of clear-code words for communicating the letters of the alphabet, especially in aviation and military. Over the decades, soldiers also have developed phrases that combine the code words in the military's phonetic alphabet. Here are some common ones:
- Charlie Mike: Continue mission
- Oscar Mike: On the move
- Bravo Zulu: Good job/well done
- November Golf: No go/fail
- Tango Mike: Thanks much
- Tango Yankee: Thank you
- Lima Charlie: Loud and clear
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