"sus" short for "suspicious," often linked to the video game Among Us which became very popular during the pandemic. I'm not sure if that was the origin; the Zoomers seem to like their abbreviations ("rizz" being short for "charisma" is another example) but Among Us definitely popularized it.
Idk about everywhere else, but “sus” or “suss”has been common slang for “suspicious/suspect” in Australia, the UK and New Zealand for at least several decades.
No. Sussed out, means to work something out. Usually implies a certain amount of trial and error, or coming to the realization slowly, depending on the context.
So, "I sussed out how to work the printer".
Sus, in British English didn't really have any meaning until the game came out.
I never argued the definition, I argued the etymology. That they are slang for the same word. They are both shortened versions of the same word.
Whatever other made-up argument you thought we were having is irrelevant, either you didn't understand and you should admit it or you moved the goal post which is sad.
I bet you'll double down, though. You seem like that kind of guy.