ツーといえばカー· also つうといえばかあ
quick to take a hint; very responsive; quick on the uptake
Also written つうと言えばかあ
Expression
彼かれとはツーと言いえばカーの仲なかだよ。以心伝心いしんでんしんの仲なかとでも言いっておこう。
He and I have a near-telepathic understanding of each other. No sooner does one of us say something than the other is already responding.