Discofox. Exactly what it sounds like. In the "related videos" with footage from the championships, I'm having trouble telling it apart from hustle. The steps in the linked video, though, are very obviously indebted to foxtrot. Just...done to disco music. My brain kind of hurts right now.
(I got there while I was actually researching something vaguely related to modernism. The resulting linkstream went something like the
obligatory xkcd comic.)