I've been running this shit since (I asked for it)

from Kendrick Lamar (Ft. Gunplay) – Cartoon & Cereal Lyrics on Rap Genius

Meaning

He’s been running things since he was young (since he was asking for cartoons and cereal)

Could also mean he is in control of his fame, or perhaps in control of his life. The verse alludes to more of his upbringing and the lessons he learned.

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