Swear when I come back I'mma be bulletproof
I'mma do it just for Proof,

from Eminem – Going Through Changes Lyrics on Rap Genius

Meaning

Bulletproof could have a couple of different meanings.
1. Bulletproof as in the normal definition; being strong enough to overcome his almost death
2. A reference to Proof being killed by a bullet

“I'mma do it just for Proof” also has more than one interpretation.
1. He’s gonna prove to the world he will come back and dominate again
2. He’s gonna pull through for Proof;

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