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1.
The act of spending a long time constantly hitting "random" on Urban Dictionary.

It's a great way to discover new terms or get a good laugh.
I spent all day UD'ing
by psychonirvanafan April 03, 2010
 
2.
Being so bored that you are searching anything and everything on Urban Dictionary, often for periods over over an hour. From the phrase OD-ing, meaning to overdose (on drugs etc.)
Person One: Dude, I'm so bored
Person Two: Me too. I'm actually UD-ing!
by Ylena Megaboredavitch May 03, 2009
 
3.
The act of being on an Instant Messenger (AIM, Yahoo IM, Windows Live, etc.) and sending your friends links to what ever you're seeing on urbandictionary.com, and they send you one back, and so on.
Guy 1: So what were you doing yesterday?

Guy 2: I was UDing with Dean.

Guy 1: Douche.
by JavzMyster August 20, 2009
 
4.
stands for "Urban Dictionary-ing" or searching something up on Urban Dictionary.
i was UD'ing the other tday and found like the FUNNIEST word ever, now i use it all the time.
by cleversmynamee July 10, 2008