Usually occurs in sci-fi works, Meat Moss is when a facility, usually a lab of some sort, is altered by The Virus where the walls are covered with a thick meaty biomass. This is also typical of an alien race that uses Organic Technology. Although, it is a good way of saying "This is The Virus's territory" or "The heroes are on a techno-organic spaceship", it raises questions as to how this biomass is sustaining itself as well as its purpose other than as setting decor. Sufficient amounts of meat moss can also result in a Womb Level. And when it's divine punishment, you have the Bloody Bowels of Hell. Compare Mordor.