This is often a marketing term used by sellers on dark web forums or Telegram to suggest the credentials are "fresh" (unlikely to have been reset) or have a high success rate. Security and Legal Risks
If you suspect your data is in such a list, security experts from Norton Support and Have I Been Pwned recommend: Combolists and ULP Files on the Dark Web - Group-IB
Compiled from multiple historical data breaches, phishing campaigns, or logs from "infostealer" malware.
Using such lists for email marketing is highly discouraged; it leads to blacklisted domains , high spam complaints, and severe legal penalties. How to Protect Yourself