What does D-DAY mean?

Other definitions of D-DAY:
- D DAY IS WHEN THE FRIDAY IS D DAY AND I SAY TOMORROW IS D2 AND THE DEADLINE IS D DAY ! SO AND SATURDAY IS D DAY AND NOW ON IS D2
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How to use the term
D-DAY:
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it's. .Today is Friday. And, it's a D2. So, when is D2? There is a D2 so when is a D2? Emm.. Okay it should be like this. I will be on Vacation, what day is it today? I will be on Vacation on February 28th, so I write in my diary D2.
References:
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