Often abbreviated to RDS.
Rainy Day Syndrome is the instance where one has exhausted the supply of fun within one's household and begins to feel compelled to venture outdoors.
Guy: "Let's see....I've been on the PC and have been on various websites and contracted various viruses....I've tried to breed the cat and the dog....and I've experimented on hobos...I think I'll go outside".

Hobo: "Thanks to that kid's Rainy Day Syndrome, I now have 8 fingers on each hand and a rather large phallus protruding from my spinal cord".
by Shtig December 18, 2006
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