This page is about the slang term wacko
crazy, insane, mad
- 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.
- Bernie reckons anyone who really thinks the world was made in a few days about five thousand years ago must be wacko.
We saw this wacko guy at the airport. He was running around
Contributor: Matt Errey