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The day preceding Good Friday. It is celebrated by consuming copious amounts of alcohol and singing songs of merriment. Great Thursday typically results in a hangover so fierce it takes 3 days to resurrect ones self.
Ryan: "hey Blair do you work on Good Friday?"

Blair: "no, i plan on drinking on Great Thursday and having a 3 day hangover."
by Narhwal Lover February 25, 2013
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