1. superlative form of nutsy; most crazy, silly, or eccentric in behavior or character
Usage: informal; often used in casual speech to describe someone acting in a wild or irrational way
2. superlative form of nutty; containing the most nuts or having the strongest nut flavor
Usage: literal sense referring to food or texture

Examples

• That was the nutsiest idea I've ever heard!
• He's acting the nutsiest I've ever seen him.
• The nutsiest part of the whole situation was that nobody seemed to care.
• This brownie is the nutsiest batch she's made all year.
• Her nutsiest outfit yet got everyone's attention at the party.
• The nutsiest thing about that plan is that it might actually work.