D'oh! is Homer Simpson's signature catchphrase from The Simpsons, the long-running animated series created by Matt Groening that first aired in 1989. Voiced by Dan Castellaneta, Homer utters it whenever his plans backfire or he realises he has made a foolish mistake. The exclamation became one of television's most recognisable catchphrases through reruns, clips and merchandise. Online, it sits alongside other short reaction sounds like bruh in meme edits and fail compilations, where a single word instantly signals frustration without any explanation needed.