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1.
1) A commonly used gym bag or traveling bag that can be used to transport large quantities of beer.

2) A bag in which a bottle of beer explodes/breaks and the beer is left in the bag.
Ryan i just love your big black beer sack

All hail the mighty beer sack.

Stop having orgasmic laughs about my beer sack.
by thefloyd2112 December 12, 2009