I wet y'all all with the holy water
Spray from the Heckler-Koch automatic

from Jay Z – Lucifer Lyrics on Rap Genius

Meaning

Jay splashes them with bullets from a Heckler & Koch automatic weapon, which are rendered “holy” because of the supposed just cause of Jay’s revenge mission. Jay also emphasizes Heckler here, thus taking on a dual meaning, as Jay is going to wet his hecklers or haters

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