that dog don't run

Phrase

Southern US idiomatic

(US, Southern, idiomatic) An expression of disapproval or disbelief.

Japanese Meaning

不服や驚きを表現する、信じがたい・受け入れがたい状況に対する呆れの意を示す表現 / 物事の常識や期待を裏切る、信じ難い状況に対する軽い批判・失望の意を込めた言い方

When he claimed he'd finish the project overnight, I just laughed and said, 'that dog don't run.'

彼が一晩でプロジェクトを終わらせると言ったとき、私はただ笑って『そんな話は信じられない』と言った。

Sense（1）

(US, Southern, idiomatic) An expression of disapproval or disbelief.

I've known that boy all his life. Dependable? On time? Nah, that dog don't run.