哥是纯洁小先森姐是可爱小萌女
[gē shì chún jié xiăo xiān sēn jiĕ shì kĕ ài xiăo méng nǚ]
Translates to 'I (a boy) am an innocent little gentleman, and I (a girl) am a cute little girl,' reflecting a playful, youthful, and innocent image. This might imply the intention to come across as sweet and pure.