We came up like worms in the rain
Worms come up out of the ground when it rains because they need oxygen.
Lupe compares himself to a worm who lives in the dirt and crawls out to breathe, similar to the way he came from the ghetto and climbed out to survive.
“Came up” is also slang for achieving success while “in the rain” is slang for a difficult situation. A DEEP metaphor packed into 8 words.
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