can't hear yourself think
can't hear (oneself) think
Cannot concentrate on anything due to overwhelming noise. Can you turn down that blaring music? I can't hear myself think! There's so much construction going on during the day that you can't even hear yourself think over the chorus of jackhammers.
can't hear yourself thinkINFORMAL
COMMON If you say that you can't hear yourself think, you are complaining because there is a lot of noise that is disturbing you. For God's sake shut up. I can't hear myself think! If you're sitting in the front yard, you can't hear yourself think because the traffic is getting very, very bad.