u-deed = urban dictionaried it. If you don't know what something means and you don't want to Bing it because Bing sucks, you search for the definition of the word on Urban Dictionary.
Dude A: What the hell does ROFLMAO mean?
Dude B: Rolling On Floor Laughing My Ass Off.
Dude A: How did you know?
Dude A: I u-deed it.