What does iko un-day mean?

"Iko un-day" doesn't appear to be a common phrase in any language. It's possible there's a typo, or it's a very niche or specific term.

Could you please provide more context? For example:

* Where did you hear this phrase? (e.g., a book, a movie, a conversation)

* What was the context of the phrase? (e.g., what were people talking about before or after)

* Do you have any idea what language it might be from?

With more information, I can help you understand what "iko un-day" might mean.