Coco Coir, the most cost effective organic medium is made of fibrous strings found between the coconut and its hard shell. Some people call coco coir as coco peat and is used as a substitute for sphagnum i.e. peat moss
No source has defined this word officially but you would come across to one liner descriptions in several gardening forums. Cocoponics could be well understood as growing in coco with the help of hydroponics.