This article is from the The Simpsons FAQ, by Ondre Lombard wakkojr@nospam.wcat.com and Andrew Gill superluser@mail.rit.edu with numerous contributions by others.
D'oh is the accepted spelling, and has been seen spelled that way in
[3F24] and [3G02]. D'ohh as been seen in a Simpsons Comic a few times,
I think. Closed Captioning refers to it as "D-ohh!" [Annoyed Grunt] is
the official spelling.
 
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