世界太狗
[shì jiè tài gŏu]
The world is too 'dog' can be interpreted as the world has been very unfriendly, harsh or unfair. In China 'dog’ is sometimes used to denote someone who behaves despicably or something bad. So, this username can indicate dissatisfaction towards unfairness in the life, love or society. It's usually a casual, joking expression.