Usually means: Self-replicating nanobots consuming all matter.
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We found 4 dictionaries that define the word grey goo:

General (3 matching dictionaries)
  1. grey goo: Wiktionary
  2. Grey Goo (video game), Grey Goo, Grey goo: Wikipedia, the Free Encyclopedia
  3. Grey goo: World Wide Words

Slang (1 matching dictionary)
  1. grey goo: Urban Dictionary

Definitions from Wiktionary (grey goo)

noun:  A hypothetical end-of-the-world event involving nanotechnology, in which out-of-control self-replicating nanobots consume all life on Earth (or another planet or moon).

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