don't ask me

I don't know; I'm not the person who can answer that question. A: "Whoa, what happened in here?" B: "Don't ask me, I just got home myself." A: "Is Nick coming tonight?" B: "Don't ask me—he hardly talks to me anymore." A: "What was the boss yelling about?" B: "Don't ask me, my desk is too far away to properly eavesdrop."

don't ask me!

used to indicate that you do not know the answer to a question and that you are surprised or irritated to be questioned. informal