我非薄荷为谁心凉我非柠檬为谁心酸
[wŏ fēi bó hé wéi shéi xīn liáng wŏ fēi níng méng wéi shéi xīn suān]
This nickname combines imagery from the refreshing but cold mint and the sour lemon to express a heart feeling indifferent or emotionally distant. It implies the person is not someone who easily lets go of feelings or is emotionally vulnerable.