Sayin' I'm a new jack, you need to be smacked

from Big Daddy Kane – Smooth Operator Lyrics on Rap Genius

Meaning

New Jack = rookie

Also, New Jack refers to a pop rapper: back in the day, New Jack Swing, a genre which fused R&B and Hip Hop, was very popular. “New Jack” rappers spit for these R&B groups. They were usually lame rappers with no flow or any real lyrical substance

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