Several decades before The Simpsons was aired, the exclamation "D'oh!" was used in the BBC radio comedy program, It's That Man Again, which ran from 1939 to 1949. It was the catchphrase of the formidable, but soft-hearted, ch… See more

As the word arose out of Castellaneta's interpretation of a non-specific direction, it did not have an official spelling for several years. Instead, it was always written in Simpsons scripts as "(Annoyed Grunt)", and then la… See more