D'oh became Homer Simpson's signature catchphrase on The Simpsons, which began as a full series in 1989 with Dan Castellaneta voicing Homer. Castellaneta adapted the drawn out annoyance sound used by actor James Finlayson in Laurel and Hardy films, shortening it into the quick burst heard here. The expression became so widely recognised that it was added to the Oxford English Dictionary in 2001. Online, the isolated clip spread through soundboards and meme edits as a universal shorthand for realising you have just done something stupid.