“Waltzing Matilda”: Slang for travelling by foot with ones things in a Matilda (bag) slung over ones back.
“Billabong”: Watering hole,
“Trooper”: State policeman
“Tucker Bag”: Food Bag
"billy": tin with a lid and a wire handle used for boiling water, making tea, etc. over an open fire
The title is Australian slang for travelling by foot with one's belongings (waltzing, derived from the German auf der Walz) in a "Matilda" (bag) slung over one's back. The song narrates the story of an itinerant worker, or "swagman", making a drink of tea at a bush camp and capturing a sheep to eat. When the sheep's owner arrives with three police officers to arrest the worker for the theft, the worker commits suicide by drowning himself in the nearby watering hole, after which his ghost haunts the site.
The original lyrics were written in 1895 by poet and nationalist Banjo Paterson. It was first published as sheet music in 1903. Extensive folklore surrounds the song and the process of its creation, to the extent that the song has its own museum, the Waltzing Matilda Centre in Winton, Queensland. In 2012, to remind Australians of the song's significance, Winton organised the inaugural Waltzing Matilda Day to be held on 6 April, the anniversary of its first performance.
The song was first recorded in 1926 as performed by John Collinson and Russell Callow.
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A video for this song: