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.
The correct way to spell it is "D'oh!" Homer's trademark "D'oh!"
manifested out of a general exclamation to indicate anger, and therefore
was and has always been referred to in scripts as "Annoyed Grunt."
Therefore most titles that feature "D'oh" in them have the "D'oh" replaced
with (Annoyed Grunt) (e.g., "E-I-E-I-(Annoyed Grunt).")
 
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