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Short for demolition party, usually held in a house, or abandon building in which the guests and hosts engage in smashing, bashing, and all around trashing of the property mostly because the property is going to be demolished or being repossessed by the bank. Activities include (and are not limited to) destroying couches, breaking windows, spray-painting the walls, breaking down doors, etc.
Tim: "That Demo Party near Providence College was sick! I stepped in so much glass!
Joel: "I know! I smashed the glass from the window! My bad."
by Arbitraryjoel July 06, 2014
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