我爹她女儿可萌了
[wŏ diē tā nǚ ér kĕ méng le]
In a humorous and casual way, this nickname means 'My father's daughter is super cute.' Here, instead of directly saying ‘my sister’ or ‘I’, the phrase adds a quirky flavor by referring to oneself or one’s sister as their father's daughter. It shows adoration and cuteness of the speaker or their sibling.