A post-2016 slang term that was stupid and uncool until the game Among Us appeared in 2020 and made it cool again. Should only be used with reference to Among Us, any usage outside of that is just cringe. But to be fair I guess most people who say "sus" nowadays have among us in their minds, so ig it's fine.
Someone in 2017: This guy who dmed me is sus
Me in 2017: Stfu stop saying sus, that term is so stupid.
Someone in 2021: This guy who dmed me is sus
Me in 2021: Dang he must be the imposter.
Me in 2017: Stfu stop saying sus, that term is so stupid.
Someone in 2021: This guy who dmed me is sus
Me in 2021: Dang he must be the imposter.
by Mary Mary Quite The Contrarian July 8, 2021
Get the susmug. 
She's will be the first person who is successful at World Domination. This person is the most superior authority you will ever meet. She has multiple personalities but never means harm (unless it's personal). Although she could be described as the bad character in a book, she could be one of the most amazing people you will ever meet.
by emperorgreg June 8, 2019
Get the Su Yingmug. by KAMIL BUT HES SUS June 7, 2021
Get the SUSmug.