brewer's dozen 

After you finish your 12 pack, you find that extra beer in the back of the fridge.

Dude, I thought I just drank my last beer, but just found the final brewer's dozen.

brewer's dozen by sorrymom October 29, 2009

Brewers Dozen 

11 bottles/cans of beer. When you visit a brewery and are given a box of beer with one short, because the brewer drank it.

I got a brewers dozen of beer from XYZ brewery today.

Brewers Dozen by mfgeorge January 29, 2012