Video After The Jump Brian Pumper is putting in work overtime trying to get his rap career off the ground. A few days ago he dropped a video for his Jay-Z diss, "She Aint Ready". The he lost a little momentum when he went on G-Unit Radio and spit the "World's Worst Freestyle". But now he's back with visuals for a new track titled "Pumper",featuring Pinky and Roxy. Brian also left a message…