Plus I hit my momma with cash from a show that I had
Supposedly, knowing nobody paid Jaz wack ass

from Jay Z – December 4th Lyrics on Rap Genius

Meaning

Since Hova was making money from drugs and his mother didn’t know about it, he used rap as a cover early on to explain where he got the cash since he didn’t have a job.

Jaz-O was Jay-Z’s mentor but they had a falling out; Jaz-O claimed Hova jacked him, so he used this line as a “shot” at him by using Jaz instead of Jay.

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