My best days, I stress days
(Lord, forgive me for all my sins for I not know...)
My best days, I stress days

from Kendrick Lamar – Sing About Me, I'm Dying of Thirst Lyrics on Rap Genius

Meaning

Even during a beautiful day, many of the stresses from Compton due to gang violence are still on his conscience causing him to be stressed and pray for forgiveness for the mistakes he may have made unknowingly.

This line relates to one of Jesus' sayings on the cross:

Father, forgive them, for they know not what they do
Luke 23:34

Kendrick stresses that he only has a “days” where he is at his best. This shows how the hood has affects even intelligent people like Kendrick and stops them living up to their potential.

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