You'll know I go for
Money when I sink my teeth in Carter III beats

from Kendrick Lamar – Best Rapper Under 25 Lyrics on Rap Genius

Meaning

Kendrick returns to the hungry metaphor that he mentioned earlier in the track. It’s easy to see he’s out for success because of how he murdered all of these Tha Carter III beats from Lil Wayne.

Kendrick also continues the countdown in this line:

Money when I sink my teeth in Carter III beats

you know I go for/4 money also continues this play on words and numbers.

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