My American wife has never heard the term moving stairway, as for *bleep* refering to cat? maybe 50yrs ago or maybe even regional, but certainly not blanket like the use of the term 'fanny'. On the subject of 'fanny'; we import so much American TV that I think we all know when an American says 'fanny' it means bum, but of course, not the homeless type.
As for my affiliation? it depends on the definition; however, my wife is American.