The act of entering a house party, recognizing that the party thrower's selected playlist is lame, locating the source of music, and hijacking the playlist to reflect your own superior musical taste.
Luke: "Dude, I can't believe they are playing bieber right now."

Matt: "Yeah man, I'm bout to go partyjack this and play some Genuwine!"
by CaliCrusher228 March 16, 2013
A person who, or the act of hijacking a party for your own purposes
person 1: hey you coming to jons going away party??

person 2: this the one at sara's?

person 1: yeah....

person 2: its was actually for sara's 20th but jon party jacked it for his going away
by gezawibles June 01, 2007
When someone prepares a party well in advance with a group of friends and another 'friend' suddenly creates another party the day before the original party with the same group of friends thereby 'Party Jacking' the original party.
Jill sets a Christmas party on Dec 20th a month in advance for her group of friends, sends invites, hires a DJ, etc and then a week before, Emily decides to throw a Christmas party on Dec 19th with the same group of friends thereby 'Party Jacking' Jill's party. No Jill knows many of her friends will not show up to her party because they will be tired, hung over, not be able to get a baby sitter 2 nights in a row, etc, etc and is forced to cancel her party. Or if she does hold the party, it ends up being lame because few people show up due to already being partied out he night before.
by Incaico December 05, 2013
When someone prepares a party well in advance with a group of friends and another 'friend' suddenly creates another party the day before the original party with the same group of friends thereby 'Party Jacking' the original party.
Jill sets a Christmas party on Dec 20th a month in advance for her group of friends, sends invites, hires a DJ, etc and then a week before, Emily decides to throw a Christmas party on Dec 19th with the same group of friends thereby 'Party Jacking' Jill's party. Jill knows many of her friends will not show up to her party because they will be tired, hung over, not be able to get a baby sitter 2 nights in a row, etc, etc and is forced to cancel her party. Or if she does hold the party, it ends up being lame because few people show up due to already being partied out he night before.
by Incaico December 05, 2013

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