Noun
(euphemistic) The word damn.
(euphemistic) The word dick or dickhead.
(euphemistic) The word douche or douchebag.
(euphemistic) The word dyke.
Any word beginning with d that is not normally taboo but is considered (often humorously) to be so in the given context.
D-word (plural D-words)
Alternative letter-case form of d-word
I'm sorry, I had to flag you for using the D-word. Source: Internet