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A party in which you watch all the Harry Potter movies that have already been made up until midnight when you then pile in a car to see the next film. Often accompanied by Harry Potter look alike contests and Potter trivia.
Bro: "Hey Dude i'm dying my hair red and shaving lightning bolts into my leg hair for the Harry Potter pre game party!!"
Dude: "Bro, don't pregame too hard"
by Justin Finch-Fletchy July 04, 2011
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