You could've had a V8
Instead of a tre-eight slug to the cranium

from Ice Cube – Check Yourself (The Message Remix) Lyrics on Rap Genius

Meaning

If you would’ve been thinking healthy, you would’ve drank some tomato juice instead of getting involved with thugs and getting shot in the head with a .38 caliber “slug” (bullet)

Quotes 80s ad slogan “I could’ve had a V8!”, where the woman pounds herself in the head for drinking a soda instead of V8’s vegetable juice

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