-just kidding
-What people use to say crap about you to you in your face and mean it but not be a complete jerk directly to you, but still are.

FYI: 75% of the time people say JK they aren't...
(Football Team's record is 0-10)
Player: You are the freaking worst QB I have ever seen!! JK!
QB: ..... ..lets see you do it......
by David Rivera May 21, 2006
Joke, Joking, or Just Kidding, because they all mean the same thing regardless of what Lee tells you.
Lee is a smart person. jk
by aspartamed April 04, 2013
Meaning "Jerk Kill"

When your jerking off and you are rudely interrupted.
"I caught Abner Jerking off a little while ago"

"Brandon, that's such a jk"

"Yeah I know Truman now hes mad at me"
by Higherel July 15, 2009
In some fonts, most notably in Facebook chat, it resembles an incredibly infuriated man of oriental descent.
Person 1: Did you see that new anime?

Person 2: Dude, that guy with the hair was totally JK.
by Alex Atlantis April 19, 2009
A guy in southwest louisiana whos nickname happens to be jk
JK is always getting mad because people make fun of his name.
by Jk Fayko January 12, 2008
short for joking, that ppl type in e-mails, on the web, etc.
You're real ugly
jk, jk
by Rosey July 05, 2003
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