What does PHD stand for?

MLA style: "PHD." Acronym Finder . 2012. AcronymFinder.com 2 Jun. 2012 http://www.acronymfinder.com/Permanent-Head-Damage-(slang)-(PHD).html
Chicago style: Acronym Finder . S.v. "PHD." Retrieved June 2 2012 from http://www.acronymfinder.com/Permanent-Head-Damage-(slang)-(PHD).html
APA style: PHD. (n.d.) Acronym Finder. (2012). Retrieved June 2 2012 from http://www.acronymfinder.com/Permanent-Head-Damage-(slang)-(PHD).html

Permanent Head Damage (slang)

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