1. a person who is eccentric, crazy, or unconventional
Usage: informal
2. an inexperienced or incompetent surfer
Usage: surfing slang

Examples

• My neighbor is a real kook who collects vintage lawn mowers.
• Everyone thought he was a kook for wearing mismatched socks every day.
• The experienced surfers avoided the kook who kept getting in their way.
• She called him a kook, but his unusual ideas often proved brilliant.
• The kook wiped out on every wave he tried to catch.
• Don’t be such a kook about trying new foods.