I am my brother's keeper, I'm still drinking
Forty's while flirting dices with the reaper

from The Jealous Guys – Life Insomniac Lyrics on Rap Genius

Meaning

He is referencing Cain’s response to God in the Old Testament story, reversing what Cain said to God while at the same time getting drunk and gambling with death. He feels he is only responsible for himself because no one appears to be his keeper

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