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1.
PLJ
A pre/post - L-joint. The marijuana cigarette (joint) used in preparation for or as a supplement after smoking an L, a rolled marijuana cigar.
Laura: "Do you have the PLJ?"
Dana: "Yes, before or after?"
Emily "I say spark 'em both"
by Noak November 10, 2007
 
2.
PLJ
Stands for Peace, Love and Joy. Used often as parting phrase similar to Peace be with you, Good luck, and Take it easy.
PERSON-A: Well i'm going to head out man.
PERSON-B: Alright, Take is easy.
PERSON-A: PLJ
by A3029689 October 23, 2013