Original: When Ridgway jokingly compared the multiple-drum-machine- and Farfisa-organ-laden recordings to Phil Spector's Wall of Sound, Berardi commented it sounded more like a "wall of voodoo", and the name stuck.
Simplified: When someone jokingly compared the multiple drum machine and farfisa organ laden recordings to Phil Spector's Wall Of Sound, Ridgway commented it sounded more like a "Wall Of Voodoo", and the name stuck.