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I have come across the word in a manga. It is said by a boy who was talking
about the future plan of selling prizes awarded from playing Pachinko.

Here is the sentence including the word:

> いつまでも たたき売{う}りなんぞ **してやせんっ** 。

I'm not sure if the word is related to the word 痩{や}せる.
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2015-05-31T03:22:39.807
24661
2016-06-04T00:57:17.927
2016-06-03T17:36:43.003
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question
colloquial-language particle-は renyōkei
What does the word 「してやせんっ」 mean?
ま is sometimes replaced with や:

>   * もうしわけありやせん （もうしわけありません）
>   * ありがとうございやす （ありがとうございます）
>   * 元気でありやす （元気であります）
>

If that's the case with your example, that part simply means してません.

I'm not sure if this is a real dialect spoken somewhere, or it's a kind of
slurred speech not particularly associated with a certain dialect.
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2015-05-31T05:16:18.523
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2015-05-31T05:16:18.523
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answer
It has nothing to do with 「[痩]{や}せる」(= to become slimmer); That is for sure.

「してやせん」＝「して + や + せん」

「して」, needless to say, is the て-form of 「する」.

「や」 is a colloquial (or regional) pronunciation of 「は」.

See here: [大辞林
「や（係助）口頭語で、係助詞『は』がなまったもの。『誰も[来]{き}やしない（こやしない）』『霧で何も見えやしない』」](https://kotobank.jp/word/%E3%82%84-647430#E5.A4.A7.E8.BE.9E.E6.9E.97.20.E7.AC.AC.E4.B8.89.E7.89.88)
(Toward the bottom of the page)

「せん」 means 「しない」.

「～～して **や** せん」＝「～～して **は** いない」 = "would/will not be doing ~~", "am not doing
~~", etc.

Other examples with the same structure:

> 「[誰]{だれ}も[食]{た}べ **や** せん！」＝「誰も食べ **は** しない！」 = "No one will eat it!"
>
> 「[車]{くるま}なんか[買]{か}え **や** せん！」＝「車なんか買え **は** しない」 = "There is no way I could
> afford a car!"
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2015-05-31T05:40:55.957
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2016-06-04T00:57:17.927
2020-06-17T08:18:27.500
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answer