1. most strange, silly, or unconventional in an amusing way
Usage: informal; superlative form of wacky

Examples

• That was the wackiest movie I’ve ever seen.
• She always comes up with the wackiest ideas for our school projects.
• The wackiest costume at the party won first prize.
• His wackiest invention was a hat that played music.
• The comedian told the wackiest jokes during his performance.
• This is the wackiest weather we’ve had all year.