Top Definition
A party in which there are 30, 30 cases of beer there, totaling 900 beers. Often there will be 30 "dirty thirties" or beer that is cheap but gets the job done. Examples: Keystone Light, Bush Light, Bush Heavy
Last night was insane! We threw a 900 party at my house. I blacked out to the max. There were dirty thirties everywhere!
by Brettc77 November 08, 2006

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