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1 definition by Corvallist

 
1.
In states where the liquor laws require that alcohol no longer be served after 2:30 a.m., beer thirty is the deadline by which alcohol much be purchased, lest the party come to a screeching halt.
"Dude, it's almost beer thirty and we're out of Coors. Better make a run to the store."
by Corvallist March 16, 2006
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