Guan-guan go the ospreys,
On the islet in the river.
The modest, retiring, virtuous young lady,
What is your QQ number.
Famous poem Guan Ju from ancient Chinese classic Book of Ode. Last verse should be "For our prince a good mate she". The changed verse rhymes just like the original, that's the joke.
This translation used James Legge's version, I assume Arthur Waley's version is a more commonly known one.