Kief J Share definition Flag A joint rolled entirely of kief. Also known as a KJ or K-Joint. "Yo man lets go smoke this Kief J I just rolled!" "Ok, Im gonna get ripped as fuck of that kief!" Kief J by boredkid420 October 7, 2011 0 0 Get merch Get the Kief J mug. Buy Now — $32.95 See more merch