A person with extremely eccentric/odd behavior and mannerisms that are seemingly oblivious to the
world around them, to the extent that it seems like they are from another planet. They are simultaneously retards and geniuses, at once both completely insane and utterly lucid. They can be very awesome, due to their general uniqueness and different
way of thinking. They can also be very
annoying, due to the fact that, while they are physically on Earth, they are, mentally, paying a visit to their Martian relatives.
The word "cloudcuckoolander" was coined by TVTropes
Wiki.