Grigoo (grigo͞o) n. A pejorative term for anything that doesn't work properly or is worthless, especially nanotechnology. (A shortened form of Grey Goo, a doomsday scenario in which runaway nanotechnology disassembles everything into grey goo.)

Grigoo entered the vernacular early in Era-1, when a new line of self-cleaning bathroom sinks came on the market without getting a thorough quality control review.  The main issue with these sinks, which were designed to break down organic matter, arose when they were used for shaving.  The embedded nanotech turned the hair follicles into a disgusting grey paste and gave off a foul smell. 

Other infamous examples of Grigoo include the first attempts at Plushite underwear, which often contorted themselves into very uncomfortable configurations, and a line of high end telescopes with nano-engineered lenses that under certain conditions exhibited unintended emergent properties, giving a distorted image. 

Entities made of naturally occurring and/or low purity computronium (which tends to be sentient, but hopelessly insane) are also commonly known as grigoos.