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• "コテンパンにやられる" is a passive form of "コテンパンにやる". "コテンパンにやる" is also said "コテンパンにやっつける" in the same meaning. They both mean "to beat a person black and blue".
• "尻尾｛しっぽ｝を巻｛ま｝いて逃｛に｝げる" is an idiomatic phrase in Japanese that expresses how a dog sneaks away or runs off with its tail between its legs when the dog loses the fight.
  Since I learned that they use "to turn tail and run" to describe the same situation in English, it is very interesting that these expressions are very similar in both languages. [1]: http://jisho.org/search/%E3%82%88

• "コテンパンにやられる" is a passive form of "コテンパンにやる". "コテンパンにやる" is also said "コテンパンにやっつける" in the same meaning. They both mean "to beat a person black and blue".
• "尻尾｛しっぽ｝を巻｛ま｝いて逃｛に｝げる" is an idiomatic phrase in Japanese that expresses figuratively how a person behaves when he loses the fight by quoting how a dog sneaks away or runs off with its tail between its legs when the dog loses the fight.

Since I learned that they use "to turn tail and run" to describe the same situation in English, it is very interesting that these expressions are very similar in both languages. [1]: http://jisho.org/search/%E3%82%88

###Example
(E) 俺が道を歩いていたら昔の友達に会った。 When I was walking the streets I met my old friend.
(F) 俺がよ、道をよ、歩いていたらよ、昔のよ、友達によ、会ったぜ。
The last ぜ is not a group of nesayo-speech, but it is usually used at the last of the sentence like (F) by a man.
It is better not to imitate (F), because it is a poorly behaved way of saying.

###Example
(E) 俺が道を歩いていたら昔の友達に会った。 When I was walking the streets I met my old friend.
(F) 俺がよ、道をよ、歩いていたらよ、昔のよ、友達によ、会ったぜ。
Though the last ぜ does not belong to the group of nesayo-speech, it is usually used at the last of the sentence like (F) by a man.
It is better not to imitate (F), because it is a poorly behaved way of saying.

According to Jisho.org here, よ in the given sentece is defined as "3 used to catch one's breath or get someone's attention ​in mid-sentence".

###Bonus
(D) それがコテンコテン しっぽ巻いて逃げちゃった
If you rewrite (D) plainly, it will be like (G).
(G) 彼がどうなったかと言うと、それが、彼は誰かにコテンパンにやられ、負け犬のように尻尾{しっぽ}を巻いて逃げたよ。
The interpretation of (G) in English will be like:
As for him, he was beaten black and blue and turned tail and ran away.

According to Jisho.org [here][1], よ in the given sentece is defined as "3 used to catch one's breath or get someone's attention ​in mid-sentence".

###Bonus
(D) それがコテンコテン しっぽ巻いて逃げちゃった
If you rewrite (D) plainly, it will be like (G).
(G) 彼がどうなったかと言うと、それが、彼は誰かにコテンパンにやられ、負け犬のように尻尾{しっぽ}を巻いて逃げたよ。
The interpretation of (G) in English will be like:
As for him, he was beaten black and blue and turned tail and ran.

• "コテンパンにやられる" is a passive form of "コテンパンにやる". "コテンパンにやる" is also said "コテンパンにやっつける" in the same meaning. They both mean "to beat a person black and blue".
• "尻尾｛しっぽ｝を巻｛ま｝いて逃｛に｝げる" is an idiomatic phrase in Japanese that expresses how a dog sneaks away or runs off with its tail between its legs when the dog loses the fight.
  Since I learned that they use "to turn tail and run" to describe the same situation in English, it is very interesting that these expressions are very similar in both languages. [1]: http://jisho.org/search/%E3%82%88