"Cack" was our word for excrement - solid, liquid, cold or still steaming. Immortalised in the nursery rhyme,

Doctor Foster went to Gloucester,
In a shower of cack.
The dozy twat forgot his hat,
And it all ran down his back.

At least on this journey he was spared the indignity of stepping into a puddle of shit that went right up to his middle; although this must have been before that occasion, considering his oath never to return to Gloucester at the conclusion of that episode.

In fact, considering his adverse reaction to just getting his legs wet in the classic rhyme, you'd imagine a faecal downpour running over his head and face, before trickling its moist brown path along his spine would have caused a much earlier embargo on Gloucester-going, that might have spared him the unfortunate puddle incident.

I bet he liked it, the Hippocratic scatwizard.