An informal short form of 'kangaroo,' the large hopping marsupial mammal native to Australia.
A simple abbreviation of 'kangaroo,' which itself comes from an Australian Aboriginal language, likely from Dharug 'gangurru.' This shows how English continually shortens common words through casual use.
The word 'kangaroo' itself was borrowed from Aboriginal Australians, then English speakers got lazy and made it 'roo'—it shows how languages are always evolving and abbreviating words in casual speech. Australians use 'roo' so much it barely registers as slang anymore!
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