That's your adrenaline rush
Like when a motherfucker have to go pick up the pump
To make his opposition chest kick up and jump

from Twista (Ft. Yungbuck (Psycho Drama)) – Adrenaline Rush Lyrics on Rap Genius

Adrenaline rushes when you pick up a pump (shotgun) his oppositions chest jumps as the barrel “kicks up” meaning it raises due to the recoil.

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