From wikipedia.org “In English military parlance, D-Day is a term often used to denote the day on which a combat attack or operation is to be initiated. Whilst the initial D in D-day stands for the word day it often represents a variable, designating the day upon which some significant event will or has occurred.” [...]
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“A backronym (or bacronym) is a phrase that is constructed “after the fact” from a previously existing word or abbreviation, the abbreviation being an initialism or an acronym. Backronyms may be invented with humorous intent, or may be a type of false or folk etymology.” [Wikipedia]
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