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Another Biscuit Island Banger
(lemmy.nz)
Complain about problems only a Brit would understand, the weather, trains, the people on the telly...
Surprisingly, there is actually a wiki page on the matter:
Wikipedia.org - Taking the Piss
Roughly covers the following:
1
2
"Are you taking the piss?" is pretty similar to "You've got to be joking, mate!" or "are you fucking kidding me!?!"
ok this makes sense with the loafing. Sounds like variation of taking more than your fair share but instead not doing your fair share.