TV
Earlier in the show, U2 member Larry Mullen is seen using the insult - which is not considered offensive in the US - on his bandmates. Mr. Burns imitates him during the closing credits.
Usually the swearing would be cut out for British television but the offending instances slipped past Channel 4 staff preparing the April 15 episode.
Broadcast regulator Ofcom received 31 complaints about the show.
"Channel 4 apologised for this offensive language and acknowledged that it was unsuitable for broadcast at 6pm," Ofcom noted. "The broadcaster explained that it has robust compliance procedures for The Simpsons."
Channel 4 blamed human error and said it was "the first time in over ten years" such a mistake had occurred.
The word was "clearly offensive language", Ofcom said. However, taking into account Channel 4's otherwise "robust" compliance performance, the regulator did not record a breach of its Broadcasting Code.
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