Slang: Wacko (meaning, examples, pronunciation)

"Wacko" is a strange or crazy person.

Example #1: We saw this wacko at the airport. He was running around saying the devil was after him.

Example #2: Some wacko has been sending the actress increasingly disturbing letters.

Example #3: Have you met Judy's sister? She's really hard to talk to, and she gets this crazy look in her eye sometimes. I think she's a bit wacko.