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1 definition by Michael Perna

 
1.
PhD
Pretty Heavy Dumper. Used to describe an ass that is quite large; not complimentary.
On the ass scale: bandonkadonk < junk in the trunk < PhD < SUV in the pants
guy 1: 'Dude, your girl has a PhD.'
guy 2: 'Go fuck yourself; she's hot.'
guy 1: 'I like big butts and I cannot lie....'
by Michael Perna January 17, 2009