Top Definition
1. All-powerful, psychotic, and cosmic form of Jean Grey from the X-Men

2. To go insane with power

3. To become destructive and bloodthirsty
1. My favorite X-Men story is when Jean Grey became Dark Phoenix.

2. Now that he's the boss, he's turned into a total Dark Phoenix.

3. She ripped through that house like Dark Phoenix through the cosmos.
by Peejer September 17, 2010

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