Poo nugget 

A dirty brown pound coin. a poo nugget

I got a poo nugget in my change after shopping

Poo nugget by Superbubble July 2, 2018

Poo Nugget 

After a satisfying dump, A Poo nugget is what hangs on at the end and refuses to let go no matter how nice you ask it.

It is known that in some Australian counties it is known as a "Michaela"

no matter how hard she tried, the poo nugget stayed clinging on
Michaela just kept hanging on.

Poo Nugget by ghostly white September 20, 2019