PK may refer to any of the following:
1. Short for jumperpark, PK is a disk drive setting that is similar to the more common slave setting found on most drives. When a drive is set to this setting it is configured as the secondary drive (slave drive).
2. Alternatively referred to as a pker, pk, or pking, player killing is an act in an online game such as a MMORPG where a player kills another real player. When playing on a PvP server this type of killing is normal. However, a player may be labeled as a pker if he or she constantly seeks out other players or grief's other players.