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1.
The word 'flag' as pronounced by people with thick Belfast accents. The term is a perfect encapsulation of the disproportionate and overblown reaction to the removal of the Union Jack (as in 'de fleg') from above City Hall in Belfast. Where previously it had flown for 365 days per year, it is now flown on 17 designated days of the year - in line with many other British cities.

The event caused a portion of the Protestant community ('fleggers') to make international pricks of themselves as they proceeded to wreck the fucking place, claiming it was another erosion of a 'British' identity they perceive to have been under attack since the horrifying spectre of equality reared its head in Northern Ireland.

The word 'fleg' - and indeed 'fleggers' - fittingly describes a section of humanity unconcerned with knowledge, reality or the vagaries of the English language. Like America's tea-baggers they are ruled by instinct, fear and paranoia with a side dish of rampant bigotry and startling ignorance of the world around them.
"Wat de fuck like! The taigs got de fleg took down! Let's wreck de fuckin place! No surrender!"

"De fleg has been took down! Before ye know it there'll be a united Ireland! Attack Short Strand! God Save The Queen!"
by OnionFleg July 07, 2013
 
2.
A tree on a wet and windy day.
e.g. when it is a rainy and windy day outside, someone could say:

"That tree is flegging"

referring to the movement of the tree in the wind, during a period of wet weather.
by The Dance King!! May 22, 2009
 
3.
To receive a fright from something, scottish slang.
"Dinnae jump out at us, ya gave us a fleg"
by Anubited May 20, 2005
 
4.
shortening of the term "flabby legs"
Holy shit, jaynie has some terrible flegs!
by Kristofur August 05, 2011
 
5.
Some where on your person in which you insert eggs, and various other items.
"I got a rather large egg stuck up my fleg the other day, it was quite uncomfortable"

Have you seen my eggs? - "Maybe you left them in your fleg?"
by Jam coated ecowarrior January 23, 2013
 
6.
A rare occurrence when an individuals leg bypasses their ankle and connects directly to their foot.
Fleg is similar to the cankle, however, there is absolutely no appearance of anything that slightly resembles an ankle.
Marshall: Daaaang! How is that lady wearing heels?
Curtis: Why?
Marshall: I just can't comprehend how she stuffed all that fleg into them.
by <3Throb November 14, 2012
 
7.
To be cuckolded; to have a significant other that sleeps around and at the same time eats you out of house and home.
Jen certainly flegged poor Bob - I heard she banged some random dudes in his bed while eating a turkey drumstick.
by Leon Trujillo May 17, 2009