Green’s Dictionary of Slang

doings n.2

(Aus.) excrement.

[Aus]‘Nino Culotta’ They’re a Weird Mob (1958) 126: ‘The doin’s’ was the contents of the lavatory pan.
[UK]J. McDonald Dict. of Obscenity etc.
[UK]Brummagem Dict. 🌐 : doings n pl. faeces; excreta.