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いやいやいや iya iya iya
No no no, hold on a second.
What does iya iya iya mean?
Three "no"s in a row: half protest, half laughter. You use it when someone says something outrageous and your brain needs a moment to catch up.
Example
いやいやいや、それはさすがに無理でしょ。
No no no, that's definitely not happening.
Vibe
Who you can say this to, and how it lands.
Friends only Casual. Natural with friends, out of place at work or with strangers.
The story behind iya iya iya
One いや is a plain no. Two is a correction. Three is comedy. The repetition works as a volume dial — いやいやいやいや appears in the wild, and the length tells you exactly how far the other person has strayed from the plausible. What is being refused is not a request but a reality.
It belongs to the tsukkomi register, the comic straight man's toolkit, and it is delivered laughing, usually with a hand half-raised. Do not confuse it with its relatives: 嫌々 written the same way means doing something reluctantly, and イヤイヤ期 is what parents call the age when a toddler refuses everything on principle. Same syllables, entirely different levels of fun.