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A drinking game. Those who are initiated into the bull moose club have to only drink with their left hands. If you are caught with a drink in your right hand, and someone who is also initiated into the bull moose club yells "BULL MOOSE" you are required to down the rest of your beverage. To be initiated into the club, a bull moose member must fill you in on the rules above, and then you have to chug a beer to pay your respective "dues."
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