Rule seven, some'in you better tell 'em
Good coke, good weed, y'all better sell 'em
Cause they'll put some'in up into your cerebellum
Proof, you better tell 'em

from Proof (Ft. J-Hill & Obie Trice) – 72nd & Central Lyrics on Rap Genius

Meaning

Rule Seven is very important. Only sell high quality cocaine and marijuana, otherwise someone will shoot a bullet into your cerebellum, which is located in your brain.

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