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Among a group of people who have all been drinking, the person who's had the least amount to drink, no matter how much that may be, becomes the official designated driver for the night.

Originates in the hard-drinking province of Saskatchewan on the prairies in western Canada.
Danny only had eight beers last night so when we went to the bar, he was the Saskatchewan Designated Driver.
by WesternCanadianProud April 12, 2006
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