UDI
Unidentified drinking injury
The bruises, cut, and sprains you find all over your body after a night of partying hard that you do not remember incurring is a UDI. Man my legs are covered with UDIs.
by Kkane June 17, 2012

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UDI'S are basically referred to as Unidentified Drinking Injuries. These occur when you are drinking of course. New injuries from drinking aren't noticed till after you are sober, you can not for the life of you remember how you received said injury, but it's obviously due to too much alcohol consumption from the night previous. When drinking you easily obtain bruises as well, so if you were drinking last night and you wake up with hella new bruises, you know why.
Friend one: "Damn dude! I woke up this morning with a fuckin' golf ball sized bruise on my thigh, what happened?!"

Friend two: "How many other UDI's did you get from last night??? I think I saw you get that one, you knocked right into a table!"

Hungover friend one: "I have nine new bruises from last night..."

Hungover friend two: "UDI's?"

Hungover friend one: "fuck, yup."
by WishyFish May 04, 2009

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Stands for Unidentified (or Unknown) Drinking Injury. Any kind of injury that is impossible to explain due to the fact that the injury occurred while drunk or otherwise in a wasted state.
When I woke up the next morning, there was an abundance of U.D.I.'s: scrapes, bruises, open flesh wounds -- I thought to myself, "I don't remember walking through a swamp or viciously attacking a laundry hamper."
by slurogue February 27, 2009

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UDI
Unidentified Driking Injury
Yo man what happened to your face?? "I dunno dude, I drank a few last night and don't remember...total U.D.I"
by Kinnelon July 14, 2003

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Un identified drinking injury.
I've got a fuckin great bruise on my head, I can't remember how I got it , I was out on the piss last night.hence U.D.I.
by Christback2 April 01, 2014

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Udi
One who is silent and looks menacing until they smile.
Man, that guy over there is such an Udi. he looked like he wanted to kill me, but instead he told me a joke. Phew.
by pezwondergirl February 14, 2011

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Udi
A very small ethnic group found in the Caucasus Mountains of Russia. Their language is (disputedly) related to Lezgin, which in turn is spoken in Azerbaijan and Daghestan. The Udi used to have two main ethnic centers in Azerbaijan: Vartashen and Nij. Azerbaijani nationalism has forced the Udi to settle in Armenia and Georgia, in scattered communities. They are a Christian people whose church is very similar to that of the Armenians. There is a movement by some Udi to form an organization "Aghvank" in Armenia, to preserve the endangered language of the Udi and their customs for future generations.
I'd like to learn more about the Udi people---their language seems to be very interesting.
by pentozali September 28, 2007

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