One of the mysteries of the English language finally explained.
1Chiefly US slang (especially in African-American usage). A newcomer, a recent arrival, a novice; especially one who is a member of a street gang or involved in criminal activities.
2Originally US= new jack swing.
Of or relating to novice gang members or their related subculture.
1940s (in an earlier sense). From new + Jack.
new jack/ˈnjuː dʒak/
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