expression
easy; simple; even an idiot can do it
Colloquial phrase meaning something is so easy that anyone can do it. Literally 'even if you're an idiot or a simpleton'. Note that チョン can also be an ethnic slur for Koreans; the expression is potentially sensitive in modern use.
See also: チョン
このゲームは馬鹿でもチョンでもクリアできるよ。
Even an idiot can clear this game.
そんなの馬鹿でもチョンでもわかる。
Even a simpleton can understand that.