Nicholas shook his head and moved closer to the gray goo.

The tunnel ran straight through the gray goo, climbing at a thirty-percent grade.

Maybe if there were too much nanotech we'd all become grey goo?

However, eventually they realize they have been hit with grey goo and their own ships are being consumed.

When they talk about grey goo, I think this is what they mean.

None of these measures would prevent a party from creating a weaponized grey goo, were such a thing possible.

The more organic material that the grey goo consumes, the less remains available for further consumption.

This is a reference to the self-replicating aspects of grey goo.

But is the world about to be dissolved into grey goo because of some new agent attacking cell walls?

Thanks to you, I am now covered in grey goo.