If someone says this in BM, don't sweat it. It stands for "Dick With Cum" and is commonly used to refer to people that can fill you up with dicks and cum, especially in BM.
Acronym for the term 'Diving Whining Choking Dogs", referring to the captain, Daniel Alfredsson, of Ottawa Senators of the National Hockey League. The 'Choking Dogs' reference is from an article in the Ottawa Sun which calls the Senators 'Choking Dogs' because of their perennial playoff implosions.
Daniel Alfredsson, also known as the DWCD, has a history of cowering in the face of adversity and finding excuses for his poor play (i.e. refereeing). For that reason he has earned the reputation as a whinner and diver in his attempts to draw opposition penalties.