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1.
PPO or Partying Purposes Only - is a phrase or acronym used when you do something in order to throw the most badass party or keeping the party flowing.
ex:
Person 1: Hey man, I just downloaded the best 100 rap songs ever.

Person 2: You Would.

Person 1: I like to have the best music for PPO(Partying Purposes Only).
by Colt Mccoy's Roommate April 06, 2010