A marketing term used by hackers to claim the data has been "checked" and currently works.
The phrase sounds like something pulled straight from the underbelly of a data breach forum. While it looks like just a file name, it represents a significant threat to digital privacy. The Anatomy of the File 145K: Refers to 145,000 individual entries.
Use a service like Have I Been Pwned to see if your email address has appeared in any known breaches.