RUD = Rapid Unscheduled Disassembly
Seems to be popularised by Elon Musk [1] but I managed to find a page which links to evidence [2] going back as far as the 70s.
[1] https://www.theguardian.com/technology/2015/jan/16/elon-musk... [2] https://space.stackexchange.com/questions/10022/who-coined-t...