A combination of the word 'Joking' and the phrase 'Just Kidding' with a slang twist. Can be used in a variety of situations.
Person one: Hey dude, you have ink all over the side of your head, are you okay?
Person two: What? Aw, you gotta be jukn me!
Person 1: Hey man, I'm moving to Nigeria.
Person 2: WHAT?! You can't go!
Person 1: Jukn, jeez....