also: いやーん
A feminine, playful, or coy interjection expressing mild refusal, protest, or feigned displeasure. Often used in a teasing or flirtatious manner.
"Oh no, don't say things like that."
She laughed and said "oh no" when she was tickled.
Derived from いや (dislike, no) with the addition of the playful, softening suffix ん. The exact origin is uncertain, but it is a colloquial formation.