Even betters what my uncle did
I pop my demo tape in start to beat my head
Peaked out my eye, see if he was beating his
He might as well say beat it kid, he's on the list

from Jay Z (Ft. Pharrell Williams) – So Ambitious Lyrics on Rap Genius

Meaning

Fast-forwarding to when Jay-Z was an aspiring rapper, he plays a little demo tape for his uncle to listen to. Then, somewhat like the teacher, the uncle just tells him to get his raps away from him, and shows no support for his dreams. Jay-Z puts him on the list of people who tried to destroy his dreams, along with his teacher.

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