M.K. Pump 

Originated from, and first performed by rap artist M.K.Russ., the action of a "M.K. Pump" occurs during, or shortly after a 'ballin' or 'pimp juice' action. It is meant to both taunt the opposition or audience such action is being performed upon, as well as to further increase your status as a 'balla', or a 'pimp juice' playa.

Mathias: Shiiiit, I saw you put his ass on the ground with that move!
Detox: Hell yea, that was sick man! And ofcourse you had to follow it up with the M.K. Pump!

M.K. Pump by mkruss February 2, 2009

M.K. Pump 

To place your arms perpendicular to your torso, at 90 degree angles, and to flex your biceps.
This action is often used after an achievement.

Jamal: After I slayed the bitch, I jizzed on her face. All this while doing the M.K. Pump.

M.K. Pump by mkruss February 4, 2009