: Stands for "Peer-to-Peer." This indicates that the release was packaged and uploaded by an individual or a group within the P2P community, rather than an organized "Scene" group (like RELOADED or SKIDROW) which follows stricter release rules.
The string refers to a specific pirated release of the video game Payday 2 . PAYDAY.2.v1.133.154.-P2P.rar
: P2P releases are unverified. They are frequently used as "wrappers" for malware, miners, or trojans that can compromise your computer. : Stands for "Peer-to-Peer