Wacko (noun)

1. A person who is eccentric or insane.
2. A person who is crazy or weird.

Origin:

Origin unknown.

Examples:

1. The old man in the corner of the park is a real wacko, I avoid him at all cost.
2. She's a bit of a wacko, but we love her for her quirkiness.
3. He's a wacko, he always talks to himself.
4. His ideas are completely wacko, nobody takes him seriously.
5. Some people think she"s a wacko, but she"s just misunderstood.