My pops knew exactly what he did when he made me
Tried to get a nut and he got a nut and what

from Jay Z (Ft. Mary J. Blige & Pain In Da Ass) – Can't Knock The Hustle Lyrics on Rap Genius

Meaning

Jay’s pops was merely trying to “get a nut” i.e. ejaculate, but instead his wife gave birth to “a nut” as in crazy person, as in Jay’s flows are crazy son! (crazy meaning bad meaning good)

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