掐指算一算姑娘你命里缺我
[qiā zhĭ suàn yī suàn gū niáng nĭ mìng lĭ quē wŏ]
Literally translated to 'Calculate with your fingers, girl, you lack me in your destiny'. This is a playful expression meaning that the user thinks they are essential for someone's happiness or completeness.