屌注孤
Diǎo zhù gū
This is a popular chinese online phrase used to describe: 孤独一生 (gu du yi sheng) which means "to be alone/lonely for life".
Basically, this is alike to calling someone a 'loner'. It is generally quite negative so you only use it on people that you do not really like or as an insult, although it can be used as a joke amongst friends.
This is also alike the popular english meme of 'forever alone' guy!