你嘴比肾还虚
[nĭ zuĭ bĭ shèn hái xū]
This nickname uses a provocative Chinese idiom implying that someone lies frequently or says things carelessly. The expression compares someone's mouth to being more deceptive than kidneys which, in traditional Chinese belief, are related to one’s vitality and honesty. This name may be adopted sarcastically by a person who considers themselves not very trustworthy or as an exaggeration of a playful personality trait.