在你婚礼上我要唱分手快乐
[zài nĭ hūn lĭ shàng wŏ yào chàng fēn shŏu kuài lè]
Literally translates to 'At your wedding, I’ll sing Happy Breakup.' Implies unresolved feelings or resentment towards an ex-partner getting married, but also mixes in sarcastic humor as a coping mechanism.