少年你脚踏两只船小心开裆少女你脚踏两只船小心走光
[shăo nián nĭ jiăo tà liăng zhĭ chuán xiăo xīn kāi dāng shăo nǚ nĭ jiăo tà liăng zhĭ chuán xiăo xīn zŏu guāng]
It refers to two persons engaging in potentially indiscreet affairs at once, metaphorically 'keeping foot' (involving oneself) in two separate boats, which is usually viewed as disloyal behavior and may easily expose their personal information ('walk out'), similar to getting caught in infidelity.