It is a common misconception that "Feck" is synonymous with the other F word. As far as I know, its original etymology is "to urinate", but that usage is not current. Nowadays, it is more common to use the word to indicate motion away from the subject, e.g. "Feck off!" = "Go away!", "I fecked the apple over the wall" = "I threw the apple over the wall". There are those of us who believe that Feck also has the meaning of "to steal quickly" when applied to small objects. For example, "I fecked an apple off the shop counter" = "I snatched an apple from the shop counter." This opinion is controversial, however, and may cause hilarity when expressed among those who are unfamiliar with the usage.