If I exist right now I damn sure can't provide you proof

from El-P (Ft. Paul Banks) – Works Every Time Lyrics on Rap Genius

Meaning

He’s so high that he’s having an out of body experience.

Philosophically speaking, you can’t prove your existence to somebody else. However, you can prove it to yourself.

I think, therefore I am.

Alternatively, it could mean that he’s having an existential crisis — He wonders whether his life has any ‘meaning, purpose or value’.

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