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.
「いやん、そんなこと言わないでよ。」
"Oh no, don't say things like that."
彼女はくすぐられて「いやん」と笑った。
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.