expression, noun-modifying (irregular)
such a stupid ...; what a crazy ...
Abbreviation of そんな馬鹿な, used prenominally to express disbelief or exasperation about a noun. Colloquial and emphatic.
See also: そんな馬鹿な
んな馬鹿な話があるか。
Is there such a stupid story?
んな馬鹿なこと言うなよ。
Don't say such a stupid thing.
interjection
no way!; what nonsense!; how can that be?
Abbreviation of そんなバカな, used as an interjection to express strong disbelief or rejection. Usually written in kana.
See also: そんなバカな
え、試験に落ちたって？んなばかな！
What? You failed the exam? No way!
んなばかな、そんなことあるわけない。
What nonsense! That can't be true.
The full form; んな馬鹿な is a colloquial contraction used in casual speech.
Colloquial contraction of そんな馬鹿な (sonna baka na). The exact historical derivation is uncertain, but it is a common casual shortening.