[friendstock]

PK = penalty kick

[bfung]

PK = 仆街 (pok kai). I find it funny when playing mmo's and people use PK as Player Kill, hehe.

[friendstock]

wow ok... haha, I always thought the term (used widely in Taiwan too) came from soccer...

Perhaps the coincidence that there is a cantonese term AND it also stands for Player Kill made "PK" take off?

http://www.urbandictionary.com/define.php?term=pk