Then expand to the Hoover dam, water

from Kendrick Lamar (Ft. BJ The Chicago Kid) – R.O.T.C (Interlude) Lyrics on Rap Genius

Meaning

Kendrick’s going to start out “Moving grams” of either cocaine or marijuana, until he has enough money to start selling PCP, otherwise known as water. He also references the Hoover dam, which is a man-made dam on the border of Arizona and Nevada. Like any other dam, it blocks/regulates the flow of water.

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