A hot-headed NYPD cop pepper-sprayed a Queens man while he was down — and then kept spraying and spraying. 



The stunning altercation — caught on surveillance video exclusively obtained by the Daily News — played out at a St. Albans bodega. Afterward, the victim said, a cop hurled a racial slur at him. 



Stefon Luckey, 34, who is black, is seen entering the deli, followed by four light-skinned cops. He struggles as they argue and one of the officers pushes him down an aisle, into a shelf. 



Two of the cops leave and things seem to simmer down, when suddenly one male cop whips out a can of pepper spray and squirts Luckey in the face. 



Luckey, who stands 6-foot-4 and weighs 300 pounds, covers his eyes with his arm and stumbles to the back of the store. 



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