You learn something new every day. I did not know the british referred to it as a chopper. I am kind of missing the connection between chopper and that part or its multitude of uses. Maybe the british do it differently
or we have been doing it wrong.
A chopper over here, in the former superpower, is a motorcycle, dentures, teeth or a tree shredder. I suspect if one over here said "wanna see my chopper", the girl may get worried