According to Georgia's GlossaryEdit

From the Australian outback. A billycan was something Aborigines boiled their goodies in, or whatever it is they eat. Anyway, billio means boiling things up. Therefore, "my cheeks ached like a billio," means - er - very achy. I don't know why we say it. It's a mystery, like many things. But that's the beauty of life.

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