expression
as for that thing; given that; the matter is
Colloquial contraction of ことでは, used in casual speech to refer to a situation or matter, often with a nuance of 'when it comes to that' or 'as for that thing'.
そんなこっちゃ、誰も納得せえへんで。
With that kind of thing, nobody's going to be convinced.
こっちゃもう終わった話や。
As for that, it's already a done deal.
expression
it is a ... thing; it's that ...
Kansai dialect contraction of ことじゃ, equivalent to standard ことだ. Used to make explanatory or emphatic statements about a situation.
そら大変なこっちゃ。
That's a serious matter.
ほんまに嬉しいこっちゃなあ。
It's really a happy thing, isn't it.