I roll up on ya block, then I blast
Cops fiending to ask, "Who shot you?" while you rock an oxygen mask

from Slaughterhouse – DJ Green Lantern "D.O.A." Freestyle Part 2 Lyrics on Rap Genius

Meaning

Crook’s elaboration of his plan to get you contains a clever reference to one of the greatest dis songs of all time, Biggie’s you-know-damn-well-it-was-directed-at-Tupac verbal massacre “Who Shot Ya?”

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