囧

Recently I discovered that some people use this almost obsolete Chinese word 囧 as an emoticon like :) Originally, this word is an equivalent form of the first word in the phrase 炯炯有神.

See this wiki article for detail.

It is difficult (if not impossible) to create your own Chinese words. Sure you can write (draw) your own word, but how do you get it to Unicode? In alphabet language such as English, anyone makes any word anytime... so it is fairly interesting that people make new use of a pictograph as an emoticon.

My take is also 有人認為應該尊重漢字，用來惡搞不雅 有損中華民族文化的厚重感