Dust bunny

Dust bunnies (often one word, dustbunnies) are little clumps of fluff that form under furniture and in corners that are not cleaned regularly. They are made of hair, lint, dead skin, and dust, and are held together by static electricity and entanglement.

Dust bunnies are frequently a source of amusement, attested to by the many websites on the care and feeding of dust bunnies. Many cartoons reference dust bunnies, and parents often give tongue-in-cheek warnings to their children that dust bunnies will haunt them if they do not clean their rooms.

However, they can actually be harmful when they house dust mites or similar problem materials. A Dustbunny Cleaner has even been invented. It consists of a robotic ball with an electrostatic sleeve that rolls about under furniture collecting dustbunnies and other material.

OH NOES

In British English, dust bunnies are sometimes called beggar's velvet.

In the 20th Century Fox release of the Japanese anime film My Neighbor Totoro, the phrase dust bunnies is used to translate Makkuro Kurosuke, a kind of animated dirt that inhabits abandoned buildings. A more literal translation would be pitch-black blackies.