(N) The abbreviation, D, is a short-hand word used to
abbreviate the word "Douche" or "Douchebag".
It was invented so people off all ages could say the word, Douche, without the
consequences of
getting in trouble by saying the formally socially-unacceptable word.
"D of the Day" is a common phrase associated with this word to describe someone who has said a phrase that wins the "Douchebag of the Day" award