I heard this joke referenced on yesterday’s Commute for Me (臺通) podcast. The host didn’t actually tell the whole joke, but just the punchline:

「有兩個人一起生活 一個名叫詠蘭，另一個名叫貢九 詠蘭負責打獵，貢九則是負責在家煮飯做事 有一天，家裡發生大火，有人就趕快去通知在外打獵的詠蘭，要詠蘭快去叫貢九逃。 詠蘭叫貢九逃 用懶叫打石頭(台語)」 (I found the original joke on Dcard here).

(“There were once two people who lived together, one was called Yonglan (詠蘭) and the other was called Gongjiu (貢九). Yonglan took responsibility for hunting, while Gongjiu cooked at home and did the chores. One day there was a big fire in the house, so someone quickly went to find Yonglan, who was out hunting, to tell Gongjiu to flee. Yonglan told Gongjiu to flee.”)

Haha, right? (*smile, nod and no-one will notice you didn’t get it*). Yes, the joke doesn’t work in English because it plays on the differences between Mandarin and Taiwanese. So the phrase 「詠蘭叫貢九逃」(yǒnglán jiào gòngjiǔ táo / “Yonglan tells Gongjiu to flee”) in Mandarin, sounds like the Taiwanese 用 lān鳥 摃 石頭 iōng lān-chiáu  kòng chio̍h-thâu (“Using your penis to hit rocks”). Brings back the heady whiff of teenage angst and high school locker rooms, right?

You can listen to one of the hosts telling this joke on the podcast below from the 9:38 point:

「這故事我從頭到尾有點忘記了，然後呢，最後就是出現一句話。詠蘭，裡面有個角色，阿姨叫貢九，然後詠蘭叫貢九逃。是台語『用 lān鳥 摃 石頭』。」

(“I’ve forgotten the ins and outs of the story, but, there’s a sentence at the end. Yonglan is one of the characters, and her aunt is Gongjiu. And so, YongLan tells Gongjiu to flee. Which sounds like “Using your penis to hit rocks” in Taiwanese.