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fettlin' - meaning to fuck.
- to fuck a boiler (ugly girl).
comes from the steel industry originaly as it means to scrape the slag out of a furnace.
i ended up fettlin' that boiler lastnight. she was nasty.
fettlin' by funnily conical February 17, 2005
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fettling 

giving something a good clean. (yorkshire/northern english)
not to be confused with furtling, which is something else altogether.
by 'eck, t'back parlour were filthy. It looks reet gradely now i've gi'n it a good fettling.
fettling by juliebtw October 15, 2005