PJ (acronym) Type: noun, slang, acronym Pronunciation: /P-Jay/ Also spelled: P.J. Plural: PJ’s What does PJ mean and stand for? Private Jet. PJ is short for Private Jet. Example sentence: “We took the PJ from New York to Miami.” PJ in songs: “I’m on a PJ lightin’ it up, Backwood full of sticky, woo” – […]