Meaning of הזוי / הזיה

I’m fluent in Hebrew from living in Israel and I always understood the word הזוי strictly through context

I saw the word on a poster today and decided to translate it - google translate says it means “delusional” but that doesn’t really fit the meaning I’ve come to understand of it. (My understanding from context is more “unbelievable, crazy, unexpected” leading rather than delusion)

Can anybody elaborate?