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a Thunderstorm occurring over a Maelstrom, much like in Pirates of the Caribbean 3. Or a Maelstrom occurring underneath a Thunderstorm, either way you look at it.
Pete: Guys, we should turn the boat around, there is a thunderstorm a head!
Jake: Not just that, there is also a giant whirlpool!
Captain: 1337, a Thunderstrom!
by Cailean July 27, 2007
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