I might hit the gin once a month
I'll let you inhale, like an atheist

from Kendrick Lamar – H.O.C. Lyrics on Rap Genius

Meaning

The farthest he’ll intoxicate himself is a sip of gin. He’ll let you smoke while he stays sober.

Atheists don’t believe in God and will end up in hell (“inhale”).

Kendrick may be also putting his own spin on Lil Wayne’s line from La La La “Give these niggas hell like they all atheist.”

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