Catportation (catfinition): Cataportation is a system or process by which felines sometimes travel. Whether by magic or advanced feline science and technology, cats have an amazing ability to transport themselves to unusual locations, generally surprising people when they show up. The system seems analogous to organic matter transmitter or teleportation systems featured in human fiction. Many catalogists theorize the ability may be a natural feline skill, perhaps associated with their fur or tail.
The other theory advanced to explain catportation is that cats are masters of quantum mechanics that move through other dimensions.