The story
Ultimately of Australian Aboriginal derivation; named for the Belyando River of central Queensland. The expression dates from no later 1891, from when it was in use in a shearer′s song.
Etymology from Wiktionary, CC BY-SA 4.0.
Belyando spew
Today it means: An illness afflicting shearers, characterised by vomiting after meals and presumed to have been due to the hard work of shearing bent over in stifling heat (though more likely due to a local grass). Full definition →