Someone who behaves in a reckless, self-destructive manner.
From Japanese kamikaze (divine wind), from kami (god, divinity) + kaze (wind). Earliest documented use: 1896.
In Japanese folklore, kamikaze was the divine wind that destroyed a Mongol invasion fleet under Kublai Khan. In World War II, the kamikaze were suicidal attacks by Japanese pilots who crashed their planes on an enemy target such as a ship.