Sawed off shotgun, hand on the pump
Left hand on a forty, [puffin onna blunt]
Pumped my shotgun, [niggas didn't jump]

from Cypress Hill – Hand on the Pump Lyrics on Rap Genius


With his left hand holding a cold beverage, that leaves only his right hand to manipulate the weapon. That means he’s pumping and firing it one handed. This an advanced technique.

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