あたりきしゃりき

Meanings

obviously; of course; it goes without saying

usually written using kana alone

A colloquial, emphatic expression meaning something is completely obvious. Often used in casual speech, sometimes with a playful or old-fashioned feel.

そんなのあたりきしゃりきだよ。
That's totally obvious.
あたりきしゃりきじゃないか、誰だれだってわかる。
It goes without saying; anyone can see that.