Originally Posted by Chibi Mystic Gohan

The literal translation is just too awkward in English.
魔 (ma) means "demon," or "demonic." It can also mean "magic" in some contexts.
貫 (kan) to pierce, to penetrate
光 (kô) light
殺 (satsu) to kill
砲 (hô) gun, cannon

Together, they form Captain Planet the Makankôsappô, or the "Demonic Piercing Light Death Cannon."