The word "feck" is a casual way of saying "effect" or "strength." It is commonly used in informal contexts to describe someone's capability or ability to do something. Full definition
It's hard as feck reputation is kinda overestimated by a lot of people. (thesixthaxis.com)
What an idiot I am a uefa b licence coach, what do you have, and by the way you don't need a qualification to see arsenal are way short of the title, you wengerites know feck all (justarsenal.com)
because he (AW) is so fecking deluded he thinks being 13 points behind with 6 games to go means we will win the title... (justarsenal.com)