Having been apprised by THIS forum of the Brit meaning of 'fanny', I was horrified when, two summers ago when I was in London, in line for that
Big Wheel Thingie across from Big Ben, another American in line yelled at her wayward young daughter (about 6), "You better get your fanny over here right now, Missy!" I can only imagine what the Limeys' take on that was.