1. a sarcastic response used when someone states the obvious. (Statement: "Don't run that red light." Response: "No duh." Statement: "I bet it hurt when you got shot in the chest." Response: "No duh.") Also duh. Submitted by Elizabeth W. Bromberg, Birmingham, AL, USA, 08-03-1998.
NO DUH
Meaning of NO DUH in English
Slang English vocab. Английский сленговый словарь. 2012