The crossword solution for the term 'GOES ON AND ON AND...' is YAKS, which is a four-letter word. YAKS are long-haired, shaggy-coated animals that are native to the Himalayan region of Asia. They are often used as pack animals and for their milk, meat, and hides. The phrase 'goes on and on and...' is often used to describe something that continues without end, which is an apt description of the yak's long, shaggy coat.