(Okay, now open your mind up and listen to me Kendrick
I am your conscience, if you do not hear me
Then you will be history Kendrick

from Kendrick Lamar – Swimming Pools (Drank) Lyrics 2 on Rap Genius

What Kendrick is implying here is that he’s taken his body for granted, consuming excessive amounts of alcohol, and leading to a deterioration in his health. In his mind, he knows what he’s doing to his body but he’s not attempting to stop drinking — this is his conscience’s last effort to keep him from hurting his body even more than he already has.

Many people have had an experience where they’ve drank way past their bodily limit, and the terrible feeling of nausea haunts them. That little voice inside your head as you’re talking to yourself, trying to tell yourself you’re not going to throw up in an attempt to feel comfort, that’s what Kendrick portrays here.

Also, when his conscience warns Kendrick about becoming “history”, it refers to death. If he drinks too much, he will be history => dead.

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