Short for "suspect" or "suspicious", but is also used to mean lame, normie or mainstream.
Depending on the context, it can kind of mean anything describing something.
Example 1
A: "They like Gossip Girl alot."
B: "Shit, I told you they were sus af."
Example 2
"Liking Green Day became so sus. It's sad, 'cus they're really great."
Example 3
"They're acting sus."
Example 4
"Drinking lean became so sus all of a sudden. Now with xanax culture rising and all."
Sus means suspect or suspicious
Friend: I want to fuck that turtle
Me: WOW MAN THATS SUS!!
short for suspicious
GET OUT OF MY HEAD HAHAHAHHAHA SUS SUS AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
An example to say that someone in the hit game among us is suspicious
1. Short for suspicious, rose to relevance in online usage during 2020 with the game Among Us where people suspected of being the impostor would be called as such, either in voice chat or in the game's chat feature during meetings.
2. The scientific name of a pig
1. Blue: "Why'd you push the emergency meeting button, Purple?"
Purple: "Orange was acting hella sus and not actually doing any tasks."
Orange: "Actually, Red sus."
`Red was not an impostor.`
2. Do not look up the scientific name of a pig