[Hook]
My man said life ain't easy
When niggas gotta eat that's when shit gets greasy
Streets be all like "Feed me, feed me"
When niggas gotta eat that's when shit gets greasy
My man said life ain't easy
When niggas gotta eat that's when shit gets greasy

from Lupe Fiasco – Gotta Eat Lyrics on Rap Genius

Meaning

When people are desperate, they sometimes need to do dirty or greasy things to get money. This and the resulting conflict feeds into the negative aspects of the streets, which have been generalized as places of extreme violence and poverty. It feeds the cycle.

This line also means that when people get hungry they eat greasy food such as fast food. It’s comparing the illicit activities of the streets (such as drug dealing) with fast food because they are both things that can be detrimental to ones health.

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