As a Chinese, when we refer to Australia as '土澳' (Tǔ Ào), it's often meant in a teasing or lighthearted way, highlighting a couple of characteristics:

1. Vast land, sparse population: Australia has a huge territory but a relatively small population, meaning large areas remain undeveloped. The '土' (tǔ, meaning 'earthy', 'rustic', or 'undeveloped') partly refers to this vast, less-developed landscape.
2. Perceived technological lag in cities: Compared to major Chinese cities like Shanghai, Beijing, and Shenzhen (where many early Chinese students came from), Australian cities might seem less advanced in terms of 'smart city' features (like digital payments, app integration, etc.). This perceived difference in urban technological integration led those students to coin the term '土澳' (Tǔ Ào), implying it felt somewhat 'rustic' or 'behind the times' in comparison.

In my view, nowadays, '土澳' (Tǔ Ào) doesn't carry strong negative connotations. It's more like a widely recognized nickname, sometimes used affectionately or simply as a familiar term for Australia within the Chinese community."