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1.
Someone at a party who plugs their iPod into the speakers, and then thinks that they are a pro DJ becuase they can select a song. Normally accompanied with terrible, tasteless douchebag-like music.

Noun.

(Combination of DJ Grand Master Flash, and Douche)
Josh: Who the hell put this shit on ?

Ben: Some Douche Master Flash at the front.

Josh: Shut-up, you like this song you Douche Master 9000.

(See Douche Master 9000)
by greend123 April 09, 2010