'Cocker Spadge' is an affectionate term or a lighthearted greating used primarily towards young children by thier older relatives. It is common In North England around the North Yorkshire area.
It is often confused by people not from the area to be an insult. It does not take any meaning from the traditional insult of cock.
1] Someones Gran : Alright Cocker Spadge?
Granchild: Alright Gran.