It lists every Badu number since 1892. But beside each number, there is a secondary code—a series of letters and numbers that no one understands. For example: L-217 / B3 / 6-22-1949.
While there isn't a specific legendary "story" associated with this slang term, the history of Nuwara Eliya is deeply rooted in folklore and colonial heritage: The Legend of Sita Eliya : According to the nuwara eliya badu numbers in sri lanka link
According to recent district-level estimates: It lists every Badu number since 1892