A scythe is a metal blade, usually curved, on the end of a pole or stick so the the blade sticks out sideways. This type of fighting implement is usually seen as being held by Death, or the Grim Reaper. In Christianity, a scythe is seen as evil, and anyone who carries one is seen as have been contemplating with Death, aka, the Devil.
Random Old Guy: Hey, who's that guy with the pointy scythe?
Random Old Guy: *blegh* (dead)