look up any word, like lemonparty:
 
5.
jk
-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
 
8.
jk
"just kidding"
you are stupid, jk
by Mikaela September 20, 2003
 
9.
jk
joking, just kidding
Dan I hate you
Jk
by none of your beezwax April 17, 2003
 
10.
Jk
Something you say at the end of
a sentence to avoid getting beaten up when you
call someone a useless fucktard
Hey shit-for-brains! Jk
by Mrtalldude94 June 30, 2010
 
11.
JK
3rd generation Jeep Wrangler. Preceded by the YJ and TJ. Began production in model year 2007. Likely to continue until 2016 or so.
Thanks for using your JK to pull my Hummer out of the mud!
 
12.
jk
i.m talk meaning "just kidding"

mostly used by people to insult others and still stay friends with them by two faced people.SOMETIMES used in a genuine way.
How it happens-
Cheerleaderbitch08:You looked like total shit last night!
Cheerleaderbitch08:JK!
You:Ahaha you r funny.

How it should happen-
Cheerleaderbitch08:You looked like total shit last night!
Cheerleaderbitch08:JK!
You:I will b jk'ing when I have my fist in ur face.
You:Ahaha jk!

by mandeebarrett January 12, 2008
 
13.
JK
Just Kitten (meow!)

^What exactly is a "kidding?" Nobody ever told you what a "kidding" was. You just immediately are taught to say "Just kidding with you" or "Just kidding." "Just kitten" just MAKES MORE SENSE.
JK. Just Kitten. Meow!
by PhatNotes June 17, 2010
 
14.
jk
Just kidding.

an interesting variation:
jk, jk, jk ROWLING
person1- YOUR UGLY
person2- :(
person1- JK
by bethhhh October 10, 2006