姑娘你妹子带子露了
[gū niáng nĭ mèi zi dài zi lù le]
The term 'Guniang Nimei Dai zi lou' is quite informal or casual and translates crudely to 'Your girl has revealed her secret or something she wants to hide'. In online context it usually carries a teasing tone but the exact usage might vary depending on cultural nuances or situational contexts.