Origin: Keep on Truckin'

The phrase “Keep on Truckin’ “ is now a general form of encouragement in the sense of telling someone that they’re doing a good job and also as an equivalent to telling someone to go for it. It originated in the 1920’s and 1930’s with jazz musicians. Blind Boy Fuller incorporated it in a song by the name of Keep on Truckin’:

Origin: "Australia"

The name Australia derives from Latin "australis" meaning "southern", and dates back to 2nd century legends of an "unknown southern land" (that is terra australis incognita). The explorer Matthew Flinders named the land Terra Australis, which was later abbreviated to the current form. Previously, when the Dutch explored the area they named it Nova Hollandicus or New Holland.

Flinders later renamed the land Australia in a chart compiled in 1804 whilst he was held prisoner by the French in Mauritius. When he returned to England and published his works in 1814 he was forced to change the name to Terra Australis by the British Admiralty. Governor Macquarie of New South Wales became aware of Flinders' preference for the name Australia and used it in his dispatches to England. In 1824 the British Admiralty finally accepted that the continent should be known officially as Australia.

Source: http://www.sheppardsoftware.com/Oceaniaweb/factfile/Unique-facts-Oceania2.htm