also: いやーん
interjection
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.