倾城拭君半世哀伤倾世许你一世欢颜
[qīng chéng shì jūn bàn shì āi shāng qīng shì xŭ nĭ yī shì huān yán]
The meaning behind this complex nickname is about offering to wipe away someone’s half-life sadness (with companionship, presumably) in return for bringing a lifetime of joy. It indicates an extremely devoted or self-sacrificing willingness.