Like ODin' on coke, you'll get the death blow

from Tony Touch (Ft. Crooked I, Joell Ortiz & Royce Da 5'9") – Slaughter Session Lyrics on Rap Genius

Meaning

An overdose of cocaine is often fatal, and is the cause of death of several celebrities, most recently the death of Kris Kross rapper Chris Kelly

Also note the wordplay around coke and blow, blow also being slang for cocaine. Hence death blow, would quite literally also mean death due to cocaine

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