The act of causing the death of another gamer's avatar in a virtual world, often in defiance of the world's normal rules of conduct or in spite of preventative code. Often abbreviated "PK," serving as a verb, a noun, or even an
adjective describing certain players or game rule sets.
The phrase most likely arose in the development of early MUDs in the 1980's where game administrators waged a continuous struggle with players bent on defying in-game
authorities and their rules, regardless of the
repercussions to the games' stability.
"Player killing individuals who lack
the means to defend themselves is a rather
dishonorable means of
showcasing one's gameplaying prowess."
"Player killing is not against the charter on this server." -Anonymous source, Rallos Zek, Everquest Classic