Beijiing dialect
问个底儿掉
(wèngè dǐ'r diào)
To ask for the exact details of something or someone
A: Did you tell your mom about this new boyfriend?
你跟你妈提你谈恋爱的事了么?
(nǐ gēn nǐmā tí nǐ tánliàn'ài de shì le me?)
B: Of course not. How can I mention it?
必须没说。我都没法开口。
(bìxū méishuō. wǒ dōu méifǎ kāikǒu.)
A: Hmm. Indeed. She would ask many questions about him.
也是。她非得问个底儿掉不可。
(yěshì. tā fēiděi wèngè dǐ'r diào bùkě.)
B: Yeah. And I could never tell her that I met him online.
我可绝对不能告诉她我跟他是网上认识的。
(wǒ kě juédùi bùnéng gàosù tā wǒgēntā shì wǎngshàng rènshì de.)