They firin’ bullshit, that coka ain’t swimmin’
It’s coming up short, no food on the fork

from Meek Mill – In God We Trust Lyrics on Rap Genius

Meaning

When you cook cocaine to get crack, the purest part of it that actually forms the rock rises to the top of the water. You can whip it with a fork and if nothing comes up you have a bad batch. This means you came up short cause there’s no “food” on your fork

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