A "Universal Win Device". Generally used in reference to bacon.
Demonstration of the function of a UWD:

Bacon + eat = WIN
Bacon + nothing = WIN
Bacon + FAIL = WIN!!!!
by pookywb October 21, 2010
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stands for Urban Word of the Day. Arrives to subscribers via email.
Ever since the UWD on 10/16/09, I have known the name of the very real phenomenon known as procrasturbation
by TRL0 November 9, 2009
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