农夫山泉有点甜你的承诺有点悬
[nóng fū shān quán yŏu diăn tián nĭ de chéng nuò yŏu diăn xuán]
This username plays on a popular Chinese water brand, 'Nongfu Spring is somewhat sweet'. It humorously contrasts the pleasant sweetness of water with the user's doubt in someone's promise. It implies disappointment with promises made that may be hard to keep.