YOU SAID:

i am so cool you would not even understand

INTO JAPANESE

私はあなたが理解することさえできないほどかっこいい

BACK INTO ENGLISH

I'm so cool you can't even understand.

INTO JAPANESE

わかってもらえないくらいかっこいいです。

BACK INTO ENGLISH

It's so cool that you can't understand it.

INTO JAPANESE

わからないくらいかっこいい

BACK INTO ENGLISH

It's so cool I don't know.

INTO JAPANESE

わからないほどかっこいい。

BACK INTO ENGLISH

It's so cool I don't know.