I don't know, nan molla comes from the lyrics of a song called Fake Love made by South-Korean KPOP idol group called BTS. The romanized lyrics of the song say "Why you sad? I don't know, nan molla." If you ask any ARMY or BTS fan why they are sad, they will probably say nan molla.
A fictional eastern-european country. An Australian comedian under the stage name of Zladko Vladcik contributed to knowledge of "molvania" spreading over the internet, with hit songs including Elektronik Supersonik, and I am the Antipope. And the end of each song, "Zlad" as many know him, would say the line "Long live Molvania". There has been a book released about molvania, titled "Molvanîa: a Land Untouched by Modern Dentistry" Molvania was thought up by australian comedians Tom Gleisner, Santo Cilauro and Rob Sitch.