Plutonium_Milkshake Share definition Flag A loser from Indiana, middle school drop out. Thinks Slipknot is great, and is out of shape, unless the shape you are supposed to be is int he shape of a pear. Plutonium_Milkshake likes o wait for gadfire to pay for his loser ways. Plutonium_Milkshake by minnerz September 23, 2004 Get the Plutonium_Milkshake mug.