我不是萌妹纸我是纯娘们
[wŏ bù shì méng mèi zhĭ wŏ shì chún niáng men]
A playful yet assertive declaration where the user differentiates themselves from being a cute girl ('萌妹纸' can be translated as cute or childlike girl) and declares that they are truly feminine and mature ('娘们' means woman but carries a strong, straightforward tone).