a short hand version for "just kidding" used by those who can't type well. It is often verbally spoken by people who think that it's cool to sound like a moron.
Well, I did yr mom last night. J/k, lol. Ow, all this high-level thinking's makin' my brain hurt. Gtg, see ya l8r.
by Fatass February 12, 2003
j/k is common'ly used on most internet based chatting advocates it means"just playing,or just joking"playing aroundmostly used in forums or online games.someone says a de`meaning sentence to some one and after 3 seconds, after the other person is already steaming with anger the offender types i am j/k its really stupid in my opinion but it will never fail to be typed, sometimes said outside of the web'.
guy1:hey dude your moms such a bich and a big slut,you wanna know who your dad really is?".
by Linux_guy October 03, 2007