So all ya new jacks kickin' wack raps
It's a fact that I'll be on your fuckin' back like a knapsack

from Big L (Ft. Grand Daddy I.U., Jay Z, Lord Finesse, Microphone Nut & Party Arty) – Da Graveyard Lyrics on Rap Genius

Meaning

New rappers without appreciation for the art of hip hop (new jacks) need to watch their back when Finesse is around because “it’s a fact” that Finesse—a respected rapper true to the form—will attack them. He emphasizes the child-like abilities of the new jacks by referencing napsacks

Crazy double syllable wordplay here

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