你若喝酒请你吃醋
[nĭ ruò hē jiŭ qĭng nĭ chī cù]
This playful phrase means 'if you drink alcohol, then I'll feed you vinegar'. While literally about offering sour vinegar to someone consuming wine/beer etc., culturally it humorously alludes to jealousy, implying playful jibes towards possessive love in relationships.