koala head

Name given to someone with a head which is exactly the same shape as a koala's head. Usually only fat bald security guards can achieve this interspecific resemblance. The effect can be heightened if the koala-headed person has his hair cut in the Pork Scotch style.

Why has someone brought a koala to the braaivleis?

They haven't. What you're looking at is the Porky Scotcher. The ugly bastard has a koala head.