And all I had to give her was my pipe dream
Of how I'd rock the mic and make it to the bright screen

from 2Pac – Keep Ya Head Up Lyrics on Rap Genius

Meaning

Pac’s mother did so much for him and he realizes how hard it was for her to raise him. as a child all he could give her in return were his dreams of being a famous rapper

Also, possible play on words with pipe and rock. He’s talking about his mom here who, later in the song, he blames for making his brother a crack baby.

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