The Word "Fanny"
In the USA, elderly women often use the term "fanny" to refer to their large backsides. It is also commonly used in the phrase "fanny pack" when referring to the small waste-band satchel frequently worn by tourists.
In Australia, however, the word "fanny" should NOT be used in polite conversation. It refers to a woman's private part, more commonly known as a "you know what" or a "what-sa-mi-whozit". The tourist satchel is always called a "bum bag" in Australia.
Rooting in the USA simply means "supporting through good cheer". One "roots for" their local sports team or for their friend's big job interview.
Rooting in Australia simply means "having sex". It is a colloquial term that is only slightly more socially acceptable than the "F" word.
As a 13 year-old Australian girl visiting the USA on a cultural exchange back in 1990, I was told by my host mother, a 50-year-old housewife that her "fanny is sore because we were sitting in the stands rooting for our team all day."
My response to this statement was a wide-eyed "your WHAT is WHAT because you did WHAT?"