The term comes from the practice of adding gun powder to an alcoholic liquid and putting a match to it. If the powder ignited then the drink was "Proven". Now is used to show the alcohol content of a beverage. It is calculated by multiplying the % of alcohol in a drink by 2. Ergo, the max proof of an alcoholic drink is 200.
Despite the beers lower proof than the Everclear, if you beerbong 13, you still pass out.
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