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A mass of world dominating self-reproducing nanobots. Grey goo common end-of-the-world scenario, where malfunctioning nanobots reproduce without inhibition, consuming any available raw materials.

Grey goo can also be used to describe any number of warm breakfast cereals, such as oatmeal, cream of wheat, or grits.
Man, when national labs release grey goo, I'm heading off to the mountains in Alaska before I get consumed alive.
de slackwarelinuxuser 15 novembre 2007