柠檬加醋心该有多酸薄荷加冰心该有多冷
[níng méng jiā cù xīn gāi yŏu duō suān bó hé jiā bīng xīn gāi yŏu duō lĕng]
Describes emotions being so sour that it's as if lemon mixed with vinegar and heart being cold like icy mint leaves; a vivid metaphorical expression of complex feelings.