I've come across both できんでえ and ~てやんでえ today but I'm not sure what they mean
or what their origin is. There's some information relating to ~てやんでえ online
which seems to point to it being a question ("what did you say?") in casual
speech:

> 「保護と言えば、いつかこんなこと言っていた者もいたよ。『俺ら、前のことが分っちゃったもんで会社に入っている保険屋から断わらちゃったい。
> ほんだもんでガン保険に入ることが **できんでえ** 。 そんな馬鹿な話あるけえなあ。 ガンが一番恐いのは俺たちなのになあ』って。 全くだよ」

Is that right?

Edit: The conversation is taking place between two men from 焼津市 and it's a
real conversation that took place about 30 years ago if that helps at all.
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2020-12-27T09:38:19.367
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question
grammar contractions kansai-ben casual
Casual speech - できんでえ / てやんでえ
From context, my take on できんでえ here is that it's a dialect version of できないのだ,
probably Kansai-ben, further abbreviated and shifted in a casual-speech
register.

  * できないのだ → できぬのだい → できんでえ

That said, I'm not that familiar with Kansai-ben, so I hope that those more
knowledgeable might comment with any necessary corrections.
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2020-12-28T08:24:09.430
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てやんでえ used to be a Kanto dialect (nowadays it's more of a stereotypical phrase
associated with edo-period commoners, and is not actually used in daily
contexts). It comes from 言っていやがるんだ and translates to "what the hell are
they/you saying". It's NOT a Kansai or Kyushu dialect. For example:

```

    「なんで高利貸しに金返すんだよ！」　「てやんでぇ！約束したものは返さねーとお天道様に申し訳がたたねぇ！」
    
```

As for できんでえ, I'm not from that area but I'm pretty sure it means できないので.
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2020-12-28T10:41:25.783
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