My Mum, rest her soul, was quite staid in her everyday dealings but occasionaly she used to sing some bawdy words to songs. One was 'The Red Flag' (The working class can kiss my arse, I've got a foreman's job at last) but coming back to The Campbells are coming she used to sing

"The Campbells are coming, they've been before
They piddled all over the kitchen floor"

That's the only line I recall her singing. I never thought anything of it until, many years later, I went to Glen Coe and learned that the Campbell clan were still hated up there! I know they did far worse than piddling on the floor but I remembered those words again. Now, a thread on Scottish music has reminded me again.

Anyone else know of this parody or any more words?