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The sentence said by a boy who looks like being angry because of something.

なんでもねえやこっちの **こったい**! なんにしてもおれはでねえぞっ 一歩だってこの ひみつ練習場を...

I have found that several Japanese forums told that「なんてこったい」 means "What the
hell" or "Oh my god" but I'm not sure what just the word alone really means.
CC BY-SA 3.0
2016-09-08T10:39:15.777
39051
2016-09-10T07:21:14.823
2016-09-09T12:42:21.093
9831
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question
words colloquial-language manga
What does the word 「こったい」mean?
こっちのこったい is a colloquial contraction of こっちのことだい, _lit._ It is a matter of
my/our side, → "It's not your concern." "It's none of your business."

Compare:  
なんてこったい！ → なんてことだい "What the hell?"  
いやなこったい！ → いやなことだい (≂ いやだ) "No way!"

Ending a sentence with ～だい is Tokyo/Edo dialect (I think), e.g.
「行くんだい！」「何言ってんだい！」

* * *

なんでもねえや → It's nothing.  
こっちのこったい! → Mind your own business.  
なんにしても → In any case,  
おれはでねえぞっ → I'll never get out (of this...)  
一歩だって → not even a single step  
このひみつ(の?)練習場を... → (... get out) of this secret gym / training room...
CC BY-SA 3.0
2016-09-08T13:36:06.590
39054
2016-09-08T14:53:11.227
2016-09-08T14:53:11.227
9831
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answer
こっちのこったい is casual expression of こっちのことです

In this case, こったい is same meaning as ことです

こっちのこと means my own business

So こっちのこったい means it is my own business.
CC BY-SA 3.0
2016-09-10T07:21:14.823
39099
2016-09-10T07:21:14.823
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answer