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1.
To aimlessly and mindlessly jiggle, cajole or slap a piece of equipment of which you have no understanding of in the hope that it miraculously 'heals' itself and becomes functional once more.
Bugger!! My laptop froze up!!

Here, lemme jimmyfuck with it.... There you go, good as new.

It's dead now....

It was working when I gave it back to you!
by UDM1234 October 25, 2011
 
2.
a slang term much like douchebag, but used in Ireland, because "jimmy" refers to king james and the Irish never liked the king, the term is mostly used when you're saying something is annoying.
This computer is a jimmy fuck! It's lagging again!
by sentry354 May 13, 2007