Top Definition
A person who suffers from depression.
...if you don't take it you'll make me cry, I'm a grey ghost too. -Al Pacino in Scent of a Woman.
by DeadbyDinner October 05, 2016

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see n00b
"Can't you hit anything you Grey Ghost
by Maelstrom April 10, 2004

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Person who buffs graffitti; self appointed vigilante, removing tags and throwups.
That Grey Ghost just buffed my tag!
by Thoringerveer October 14, 2014

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