A habitual drinker who is immune to the effects of alcohol.
Good thing our designated driver has only had 10 shots because I'm fuckin wasted!
by ItsHydeyoubitches July 17, 2008
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The act of steering a car from the passenger seat while the driver performs oral sex on the passenger.
man, last night i got a designated driver from Kim..i almost lost control of the car when i nutted.
by K-Beck July 5, 2009
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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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if the bar you are at has the arcade racing games, you and your buddies race at the end of the night of course when your all drunk, whoever loses is the one that has to drive. You can go head to head or do the worst time if there is more than two of you.
guy1: are we going to do this designated driver race , it's almost closing time.
guy 2: yeah, we better.
guy 3: lets get thi*(stands up and falls down)
by jay10001 April 24, 2007
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The guy with the best motor-skills and coordination under the influence of a lot of alcohol out of all the dudes you hang out with. You depend on this guy to to drive you home when all of you are wasted and you trust him with your life. He should be able to take like 20 brews and still drive you back to base without a fatal accident or getting pulled over.
Since we all planed on drinking we decided that Arlen would be the designated drunk driver because he drove back to the city that one night without dying after drinking 15 shots of vlady.
by Kurt Grendel January 30, 2008
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person who, in the case that everyone (including them) in the group is wasted to the point that they can't drive, has to drive everybody home, even though they're also wasted. Usually can drive really well when drunk. From "The Hangover"
Phil: Come on, just to Barstow! Everyone's passing us!
Doug: No, I promised I would be the only one driving. And besides, you're drinking.
Phil: Oh what are you now, a cop? You know I drive great when I'm drunk!
Stu: That's very true. If you'll remember, Phil was our designated drunk driver in college.
by J Filthy Money June 14, 2010
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the annoying drunk you're driving home that keeps yelling out directions to his/her house
drunk guy: yooo take a left right there
you: dude those are trees
drunk guy: just trust me....

drunk guy= designated backseat driver
by yomommasofat June 29, 2009
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