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1.
A scunder can be a person or a thing. It means a "nuisance". It can be found with several pronunciations. Scunner, Scundered, Scunnered, Scunnert. It is commonly used in ulster (Northern Ireland), Scotland and the North of England.
Joe is a scunder. (Joe is a pain / nuisance)
I am scundered today (I am fed up today)
This job scunders me. (This job bores /sickens / depresses me)
by Alan Day June 01, 2005
 
2.
Derived from the word Scunt which comes from the word cunt.
Scunder has the same meaning as scunt but changed slightly to be more socially acceptable.
(In a class room)
Girl 1: I can't believe she backstabbed me
Girl 2: I know, she's sucha scunder.
by cooldude505 April 07, 2010
 
3.
Scunder is a word used in Northern Ireland. It is usually used in the past tense 'scundered' as an adjective, although similar in sound to the Scottish 'scunnert' it has its own specific meanning. A neat little phrase sums it up, 'hoisted by your own petard' It is often a personal retort, "That's you totally scundered", perhaps by some sly plan that has backfired.
He though he was being the smart one but now it's him that's totally scundered!
by AidanG August 11, 2005
 
4.
Hoisted by your own petard
You though you were smart, didn't you? Well, thats you totally scundered!
by Aidang June 03, 2005