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1.
From the word "dehydrated".

1. The refreshing feeling when one has consumed large amounts of water after a straining exercise or during an extremely hot day. Generally curing dehydration.

2. Also useable as a verb: to rehydrate.
Ex 1: In the euphoria that followed my rehydration I fell asleep naked on the floor.

Ex 2: Had I not rehydrated, I would surely have evaporated in the heat.
by Jonas Martinsson June 03, 2008