"Disco dancing is just the steady thump of a giant moron knocking in an endless nail"

This quote by Clive James is a funny way of describing the recurring and dull nature of disco dancing. By comparing it to a huge moron knocking in an endless nail, James is suggesting that the music and motions of disco dancing are dull and unimaginative. He indicates that the music is so easy and changeless that it is like a giant moron banging in a nail, which is a job that requires little thought or effort. The quote likewise indicates that disco dancing is not an innovative or stimulating activity, but rather a meaningless and dull one. In this way, James is poking fun at the disco dancing trend of the 1970s and 1980s.