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1.
1. A meaning assigned to an acronym, after the acronym has already been established, that is different from its original meaning.

2. An acronym wherein the definition was created after the acronym was decided upon, usually involving bad grammar or extra words in order to make the acronym "spell something."
1. CC used to mean "Carbon Copy," but recently it's been redefined with the backronym "Courtesy Copy."

2. The definition "Get Rid Of Slimy girlS" is a backronym set up specifically so we could call our club "G.R.O.S.S"
by Almighty August 08, 2005
 
2.
a reversed acronym. The word "backronym" was coined in 1983 by KRS-ONE, who created his rap name and then made a backronym for it, making the letters stand for something.
KRS-ONE making his name to stand for "Knowledge Reigns Supreme - Over Nearly Everyone" is an example of a backronym.
by LilBibby2342 August 10, 2005