I just want to shoot up and I'm pissed off
Cause I can't find a decent vein

from Eminem (Ft. Royce Da 5'9") – Bad Meets Evil Lyrics on Rap Genius

“Slamming” (injecting) heroin makes your veins decrease in size, so addicts often have difficulty finding a vein to inject the drug

Of course, Eminem doesn’t ACTUALLY do heroin (does he?)

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