From China Digital Space
贵国 (guì guó): expensive country
Sarcastically refers to China. The character 贵 can be an honorific way to refer to “your” but can also mean expensive. One reason this term is popular is because of discontent over high prices; 贵国 is a country in which house prices, fuel, access to power, medical costs, etc. are all too costly.
“贵国”的本义指“友邦”，但在网络世界里，您千万别这么理解，“贵（跪）国”已经有新的含义，是许多论坛，帖吧的违禁词语。大概是因为网友 们对房价贵，油价贵，权贵，医疗贵，学费贵...总之除了百姓的命贱之外，什么都贵，就算要死了，殡葬费和墓地还越来越贵，相死都不得好死啊！所以“贵 （跪）国”一词在特定的时代被赋于新的含义。