noun

• (Scotland) The greater or larger part.
  "I hae been a devil the feck o' my life"

verb

• (Ireland, slang) To steal.
  "—But why did they run away, tell us? —I know why, Cecil Thunder said. Because they had fecked cash out of the rector's room. —Who fecked it? —Kickham's brother. And they all went shares in it. But that was stealing. How could they have done that?"

verb

• (minced oath, chiefly Ireland) Used in place of fuck.
  "Earlier there was a dispute between the Chair and Proinsias de Rossa concerning the words used when a wife is getting rid of her husband. In the case of Deserted Wives' Allowance, Mr de Rossa said, it had to be proved that the wife didn't tell her husband to "feck off". Mr Tunney suggested that "get lost" might be a more appropriate expression for Mr de Rossa to use."