"FECK OFF"

Feck (or, in some senses, fek) is a monosyllable with several vernacular meanings and variations in Irish English, Scots, Middle English, and Esperanto.

The Channel 4 situation comedy Father Ted inadvertently helped to export and popularise this use of feck through its characters' liberal use of the word. In an interview, Dermot Morgan explained that, in Ireland, feck is far less offensive than fuck.
In a 1998 interview on Nickelodeon, Irish girl group B*Witched landed in hot water when a viewer complained one of the teenagers used the phrase "fuck off." Although Nickelodeon maintained that the singer had in fact said "feck off," which they described "a phrase made popular by the Channel 4 sitcom Father Ted," the item was found to be in breach of the ITC Programme Code