whacko
exclamation
[ wakˈəʊ ]
• used to express delight and enthusiasm.
• "Home on Friday. Whacko!"
wacko
adjective
• mad; insane.
• "his wacko conspiracy theories"
wacko
noun
• a crazy person.
• "a trailer park peopled by exotic wackos and misfits"
Origin:
1970s: from wacky + -o.
