Green’s Dictionary of Slang

human excrement.

1982		N. Keesing Lily on the Dustbin 48: One child ‘does its business’, talks of ‘binnie one’ or ‘binnie two’ or ‘number one’ and ‘number two’, and another ‘makes cackie’, or ‘poop’.
1984		Partridge DSUE (8th edn) 172/1: since ca. 1880.