Definitions
Century Dictionary and Cyclopedia
- n. An obsolete or dialectal variant of fake.
- n. Power; force; strength; vigor; use; value.
- n. Space; quantity; number: as, what feck of ground (how much land)? what feck o' folk (how many people)?
- n. The greatest part or number; the main part: as, the feck of a region.
- Brisk; vigorous.
- A variant of fick.
Wiktionary
- n. effect, value, vigor
- v. To throw.
- v. To steal.
- v. To leave hastily.
- v. Fuck (except literally).
- interj. Equivalent to blast, etc.http://www.irishtimes.com/newspaper/opinion/2010/0120/1224262708751.html
GNU Webster's 1913
Examples
“Mind you, Amazon still does not have an Australian branch: what the feck is up with that?”
“Sometimes it's a bit hard to distinguish the "bone" weekends and Tuesdays from the good ones, and when you have occasional commitments knowing when the big efforts are really help everybody involved. where the feck is the feckin sarcasm icon?”
“And where the feck is the Big Media to tell the voters about this growing Liberal-Ignatieff-Kinsella scandal?”
“The Booker prize-winning Irish novelist John Banville also agreed that Gough "has a point, or more than one point", but added that "his notion that shouting the word 'feck' -”
“I have seen "feck" used to get around this problem and used to establish the awesome street cred of the author.”
“To be honest I had not heard of "feck" until Father Ted came along at the end of the 90's.”
Requiems for the Departed: Crime collection inspired by Irish myths looks like a hit
“The first is that his characters like to say "feck" a lot -- an Irish variation on our much beloved "f-word.”
“The English have never been granted the same indulgence in their use of profanities as the Celts, particularly the Irish, who have virtually been given a free pass for their own variant, "feck".”
“Oh, and did I happen to mention I interviewed Kiera Knightley the other day and taught her how to say "feck" and "shite"?”
“Personally I love 'feck' and use it myself all the time, even when I could curse for real if I wanted to.”
Lists
These user-created lists contain the word ‘feck’.
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Deprefixed words
A list of words you more frequently hear used with prefixes than without.
clement, witting, ravel, whelm, fettered, licit, couth, bridled, wieldy, kempt, ingenuous, iterate and 110 more...
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Expletive Mimicry
Words that sound like words you shouldn't use.
frak, feldergarb, dagummit, daggum, gosh, darn, golly, fiddleesticks, fudge, gee, dang, shoot and 36 more...
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Goatboy's list
Goatboy's Word Emporium
juggernaut, abhor, discombobulate, fankle, oose, orchid, schadenfreude, doppleganger, garibaldi, coquette, arabesque, meme and 19 more...
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Actual Words
I checked, because I wasn't sure, but these words were coined and entered into a dictionary before I thought them up.
dishevelment, commoditize, feck, foppery, grimoire, apposite, impassible, reparable, arithmomania, patois, absquatulate, scopperil and 8 more...

pomegranate what feckless people do not have Jan 10, 2008
dahnielson Has the meaning "to throw" or "to steal" in Irish English in addition to being an accepted expletive. Oct 16, 2007
seanahan From "effect" Jan 28, 2007
sonofgroucho What, you mean as in feckless? Jan 28, 2007