Quáng Ninh is a province of Northern Vietnam, famous for coal mine with large reserves.
It also insinuates someone’s laments or is used as an ironical way to pessimistic people.
Eg.
Sao cậu than vãn nhiều thế? Quê ở Quảng Ninh à?
(Why are you complaining so much? Are you from Quang Ninh?)
Sometimes, it can indicate the color of the skin, used to talk about a person with black or brown skin.
Eg.
Đợt này trông cậu đen thế, vừa ở Quảng Ninh lên à?
(Your skin looks so dark, have you come back from Quang Ninh?)