A reference to a large, giant eye in the middle of ones forehead.
Usually is a cyclops
Gianeyes are most commonly found on the foreheads of monsters, but a recent trend in New Zealand proves that some parents prefer their children to have a gianeye. People with a gianeye are now mating with others who have one in hope to pass on the gianeye gene.
You can't tell when a gianeye is winking or blinking!