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A party in which the participants are celebrating something which would normally not deserve celebration. These parties usually take place to end a partying dry-spell.

While Seinfeld is a show about nothing, a Seinfeld party is a party for nothing.
Guy: Hey, are you coming to the celebration, tonight?
Girl: What are you celebrating?
Guy: The date! It's 10/10/10!
Girl: ...Why would you have a whole party for that?
Guy: It's a Seinfeld party!
by Deuce stain October 10, 2010
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