Not sure where it came from but you can see it here under S - https://en.wiktionary.org/wiki/Appendix:Glossary_of_British_military_slang_and_expressions#S
As for other words, I don't think we do quite so many as the Aussies but there are words like aggro, cheapo, wino, preggo used in every day speech.
Im not American so I probably didn't see a lot of this but my lasting impression was a lot of blustering and shit slinging but no real action or substance. Like everything he tried or promised either didn't get done or was half arsed. Basically i saw it as incompetence and damage through inaction rather than the malicious active damage he is doing now.