Don't waste my breath
I don't know how many moons a nigga got left

from Kendrick Lamar (Ft. Jay Z) – Bitch, Don't Kill My Vibe Remix Lyrics on Rap Genius

Meaning

Jay isn’t willing to waste his time, since despite his immense wealth and fame, he is mortal all the same, and bound to die (measuring time in this instance by lunar cycles).

This also relates back to the mentioning of “pie”

http://youtu.be/69O4PXzAQ5Y

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