Any time of the day when happy hour starts in the office. Can be any time of the day.
Oh shit, it's beer o'clock. Time to start drinking!
by Rock Strongo March 02, 2007
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The time when it is no longer legal to sell alchohol.
Lets get to the store before Beer O'Clock, I gotta get something to eat.
by LorenSC March 06, 2008
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