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It is a jedi that has turned to the dark side before or after the completion of his jedi-training. He can actually never become a true sith-lord.
Darth Vader Is a dark jedi, not a sith.
by Patrik August 01, 2004
person who thinks he pwns when in fact he doesn't.
person1: dark jedi is such a n00b
person2: i know
by tom-walker August 22, 2006