〜のなんのって
so incredibly …, you wouldn't believe how
い-adj / Verb plain form + のなんのって
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のなんのって is a spoken way of saying something was indescribably intense: 痛いのなんのって、声も出なかった, "it hurt so much I couldn't even make a sound".
It follows an adjective or verb of feeling: 痛い, 寒い, おいしい, 驚いた, 喜んだ. It often trails off, leaving the listener to imagine, or it's followed by an extreme result: 声も出なかった, 腰を抜かしそうだった, 泣き出した.
It's lively and conversational, a colloquial cousin of といったらない (N1). のなんの is sometimes used on its own, too.
Don't confuse it with のに, "even though". Because it's so colloquial, you'll hear it in stories told among friends rather than read it in formal writing.
Examples
痛いのなんのって、声も出なかった。
It hurt so much I couldn't even make a sound.
驚いたのなんのって、腰を抜かしそうだった。
I was so shocked I nearly fell over.
あの店のラーメン、おいしいのなんのって。
The ramen at that place is unbelievably good.
寒いのなんのって、手がかじかんで動かなかった。
It was so cold my hands went numb.
彼女が喜んだのなんのって、泣き出してしまった。
She was so happy she burst into tears.