Beer O'Clock 

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!

Beer O'Clock by Rock Strongo March 3, 2007

Beer O'clock 

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.

Beer O'clock by LorenSC March 7, 2008

Beer O'clock 

9:30pm

Beer O'clock by Anonymous April 4, 2003