From Wiktionary, the free dictionary
From roo (“kangaroo”) + -burger.
rooburger (plural rooburgers)
- A burger made with kangaroo meat.
1999 October 3, Libbydoo [username], “Re: OT Australia”, in alt.support.crohns-colitis[1] (Usenet):As for the food, I'm not sure about having a rooburger.
2001, Ryan Ver Berkmoes, Britain, Lonely Planet, →ISBN, page 517:Round the corner, the Redback Bar [address redacted] offers good beer and company, plus rooburgers and outback soup.
2013 January 31, Garrett Wollman, “Re: Beefburger”, in alt.usage.english[2] (Usenet):I wouldn't be surprised if rooburgers and ostrichburgers were available on a certain Southern Hemisphere island.