U - urban
D - Dictionary
R - reader

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

adj. Stands for Undead Rogue. Used to describe the kind of people you know will be douches, regardless of outside factors. Esp. in MMORPGs with PVP, they will gank regardless of level, skill, or situation.

Urban Dictionary Rage. A sudden storm of anger that compells you to write scathing definitions on Urban Dictionary for things you don't like.

Universal
Demo
Remover

Somewhat sketchy software that resets the time period of a demo for software. Questionable Legality.

UDR ; urban dictionary response

VERB; Meaning to utter, speak or proclaim; speak using Urban Dictionary as source.