The Plane of Knowledge is a central area to the game, in which people may access distant places all throughout the game world, via clickable stone portals placed throughout the zone. Thus, it is spoken of a lot while playing.
The three letters on the keyboard 'P' 'O' 'K' are in prime position for your fingers to drum across these letters on the keyboard.
Ignite: Just gimme 5mins.
I'm just going to sit here and just pok while I wait.
-Guy 2- "POK"
-Guy 1- "umm... first time having a energy drink"
-Guy 2- "Ok safe now"
POK is also the term given to ThumbDrives or USB Drives (USB Mass storage devices).
This term is derived from the brand name of Hewlett-Packard USB Drives called the "PockiDrive".
Shortened, edited and combined with the personified "POK" sound, the term "POK" took over the old USB(Thumb)Drive.
Hah, lol, my POK holds more than yours does.