suqlched up form of the word "Joke", usually used in MMO by cooldewds or AZN style slang. (keke, ^^, etc)
Usually shorting up "Is this a joke?" with the words "Is Jok?"
me: "I just camped boosmob xy and got PK´ed by A$$mastah right when it spawned".
cooldewd: "Is Jok ??"
"The jok" is basically the "cool kid" in high school, usually of the male gender. A typical jok plays rugby or football or whatever may be the cool sport with the most school spirit in that country or school. "The jok" doesn't try to hard, he's just cool. He generally has a hot body