Ancient origin. Holy lands area. First said on the Place of the Skull. LJ is a secret word used between members of a sect called "The Way". Its meaning is hidden even when it is said in full.
Commonly used in hypocritcal circles in todays culture. There are few that say LJ and really mean what it stands for †

(noun) A successful type of theft which results in an acceptable, impressive and rewarding payday for the protagonist.