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What is the etymology of the adjective jammy? As in,

Thou art a jammy bugger!

I confess I've never seen the word before. When I looked it up, I found confusing etymologies: one source says it comes from the construction jamais de guerre and an ordinary dictionary source says it comes from the word jam; I wouldn't imagine the two are related. Which is it?

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Not sure about the etymology, but "jammy" meaning "lucky" is also a very commonly used in Scotland. – Fraser Orr May 14 '11 at 1:23
And also in darkest Hertfordshire. – Brian Hooper May 14 '11 at 1:28
I'm fairly sure that jammy is ubiquitous throughout the UK. Though it could well have been a local word to start off with. – Orbling May 14 '11 at 2:19
There's a fairly clear line from "You want jam on it", to "That was a jammy [card you turned up]", to "You jammy bugger". Jamais sounds like a folk etymology to me. – TimLymington Jul 14 '11 at 13:32

Jammy is good/lucky, Jam (ie preserve) is also good (ie tasty).

There are a number of similar ones, "with jam on it" etc

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What does 'got in a jam' mean? – Thursagen May 14 '11 at 6:40
I assume thats the other meaning of jam - as in force something into a space. Which is the same meaning from the fruit's perspective! – mgb May 14 '11 at 15:00
I would assume 'got in a jam' refers to the stickiness of jam as a preserve, therefore a 'sticky situation' – nickson104 Jul 3 '15 at 7:08

I believe Jammy comes from the use of Jam boys. Jam boys covered themselves in Jam to keep insects away from their employers.This originated from the British in the Far East. Jam was an expensive commodity and obviously as we all appreciate rather nice so the Jam boy got to keep it and was considered very lucky.

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That's a big story, but I doubt that it is etymology. And I don't think that little boys with jam and flies on their skin and clothes are very happy. – rogermue Jul 3 '15 at 7:34

The phrase used where I grew up in Wales, to describe someone having an extraordinary and possibly undeserved piece of luck, was "You jammy Arab!" which might tie in to the answer given by Stateleyhome.

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