What does the word 「こったい」mean?


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.




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...




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...

