I done seen embalming fluid ruin a nigga promise

from Wale – DC Or Nothing Lyrics on Rap Genius

This is a double entendre:
“Embalming fluid” is the stuff used to perserve bodies for viewing after death, like in a post mortem. Wale is saying a promising youth is stopped short by death, presumably from being killed.

It’s also a drug, meaning a life’s ‘promise’ could be ruined by drugs.

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