From Froogville blog:

愤青 fen qing * – “angry youth” – is the term given to Chinese Netizens of a self-righteous and aggressively nationalist tendency. They are mostly young males with nothing better to do with their time than hang out online. They infest the blogs and bulletin boards of the Chinese Internet. And some of the ones with slightly better foreign language skills stalk the foreign China blogs, looking to pick a fight whenever somebody dares to make an observation that appears to be “critical” of China, or challenges the ‘orthodox view’ on hot topics such as – well, you know, “The Three T’s”.