You'll cop a bloody hiding when your father gets home!
In strine, when you cop something, you get it. And it ain't fun.
For example, you can cop a hiding, or you can cop a beating, or you can simply cop it.
It may well be that this is standard English, but Canadians have had difficultly in understanding so we include this definition for their sake.
Take a break from drinking like the author of this article did - Read why and how in his book Between Drinks: Escape the Routine, Take Control and Join the Clear Thinkers