The Collaborative International Dictionary
Feck \Feck\, n. [Abbrev. fr. effect.]
Effect. [Obs.]
Efficacy; force; value. [Scot. & Prov. Eng.]
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Amount; quantity. [Scot. & Prov. Eng.]
He had a feck o' books wi' him.
--R. L. Stevenson.The most feck, or The feck, the greater or larger part. ``The feck o' my life.''
--Burns.
Wiktionary
Etymology 1 n. 1 effect, value; vigor. 2 (cx Scotland English) The greater or larger part. vb. 1 (context Ireland slang English) To throw. 2 (context Ireland slang English) To steal. 3 (context Ireland slang English) To leave hastily. Etymology 2
vb. (context euphemistic chiefly Irish English) fuck (except literally).
Wikipedia
Feck (or, in some senses, fek or feic) has several vernacular meanings and variations in Hiberno-English, Scots and Middle English.
Usage examples of "feck".
Vern Feck took off his baseball cap and put his pink face right into the pileup, little sparks of saliva jumping out of his whistle as he blew it right under my nose.
Vern Feck ran around blowing a whistle and each player reported to his respective coach.
Then Vern Feck brought his linebackers over and we got Randy King to center for us so we could practice defending against the blitz, two setbacks and the center against blitz variations by the three linebackers.
Vern Feck jumped in and out of the defensive huddle, checking on his boys, little pink face halfshady under the baseball cap, whistle bouncing off his wet Tshirt.
Vern Feck stomped his clipboard, then turned his back to the field and looked beyond our bench, way out over the top of the stadium.
Hauptfuhrer and Vern Feck were explaining something about gapangle blocking to Dennis Smee.
This was the best revenge she could ever have and feck it, she was taking it.
Ah, feck it, there was no getting around it, she had to tell the truth.
Little I thought when I started from Waucht that I was to travel through the feck of England, not to speak of fires and slaughterings.
Then those bloody big galoots the other week, trying to put the frighteners on us, all over fecking Georgio again.
Oh, and the fact that Stephen is a whoremaster, Georgio is not as white as he likes everyone to think, and Nuala is still seeing that fecking villain of hers.
If she was going to act like a fecking overlord then she should expect it!
The first issue was getting his hands on the controller to the fecking slave collar.
He made me happy in bed, but he could be really annoying with the fecking endless questions.
Then Vern Feck brought his linebackers over and we got Randy King to center for us so we could practice defending against the blitz, two setbacks and the center against blitz variations by the three linebackers.