jackeroo Syllabification: (jack·e·roo)Pronunciation: /ˌjakəˈro͞o/ (also jackaroo) Australian informalDefinition of jackeroo noun a young man working on a sheep or cattle station to gain experience. verb [no object] work as a jackeroo. Origin: late 19th century: alteration of an Aboriginal (Queensland) term dhugai-iu 'wandering white man', by blending jack1 and kangaroojackeroo in other Oxford dictionaries Definition of jackeroo in the British & World English dictionary