I keep jacks jumping thirty six sets

from Jay Z – Breathe Easy (Lyrical Exercise) Lyrics on Rap Genius

Meaning

Jay isn’t doing any jumping jacks, he’s just keeping his customers jumping (probably drug addicts fiending for a hit)

36 sets refers to 36 ounces in a kilo. There’s no literal meaning in this line, he’s just using free association to extend the metaphor.

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