The term Down Under is a colloquialism referring to all things Australian, which is known as "the land Down Under" for its position in the southern hemisphere. This is because when one looks at a map in the most common way, Antarctica at the 'bottom' of the page, north appears to be "up" and south; "down"

Despite the term's wide usage, it is rarely used by Australians themselves, many of whom regard it with some derision. Nevertheless, Australians are not above using it themselves, as exemplified by Men at Work song "Down Under" which has become a patriotic rallying song. Australia's most famous boxing champion, Kostya Tszyu, was nicknamed as "The Thunder From Down Under".

According to Roger Ebert, "No film set in Australia is allowed to use the word Australia in its title where "Down Under" is an acceptable alternative. For example, we don't get The Rescuers in Australia or Quigley in Australia."

Male comedians occasionally use the phrase "I'm huge Down Under" as a double ent ...more

Australia is sometimes called "the land down under" because it lies in the Southern Hemisphere. This great distance from large European population centres and heavily travelled trade routes also helps account for Australia's late discovery by Europeans and its being the last habitable continent populated by them.

Because it is lowest land mass on the globe next to Antarctica.