Lyrically, "World Scum" is about a variety of disasters making up doomsday, including wars, torture, plague and famine. In addition to imaginations, lines include real-life disasters, including JFK assassination and bombings of Hiroshima and Nagasaki. The song title is sung six times, matching with 'blood scum'.
A man dreams about hunting down frogs and dissecting it while serving time in prison. His dream begins when another man sorts pills into separate petri dishes and starts dissecting a frog to analyze its interior, while he hunts down frogs through the window using the sniper rifle. Then he goes out to bring more frogs in for dissection but he gets attacked by a slaver armed with an ax, dismembering his lower right leg. Snakes would start eating tissues where his leg was cut as a flock of sheep roam by. Then the man in lab apron went to check on him and found that he's brutally beaten, and confronted the ax man about the attack. The attacker swings an ax onto him one more time to make him perish. And then like the first scene of this music video, the final scene shows the same man sitting in the cell after his nightmarish dream is over.