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A word used to describe something that is looking good, attractive, sexy, classy or any other adjective of sight with a positive connotation. Although this word originated as a noun for a body of water, it evolved into an adjective because it sounds too much like one not to be.
Hey girl, you're looking rather reservoir today ;)

The party was so reservoir, there were celebrities everywhere in gowns.
by feedmysoul June 01, 2011
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