The plural form of the word 'sus', which means a person who is suspicious or mistrustful of others.
Being sus is usually not a good thing because it means you don't trust other people.
Examples:
The suses in the group were always watching everyone else.
I don't like to be around suses because they make me feel uncomfortable.
The suses think someone took their toy.
The suses were looking at me like I did something wrong, but I didn't.
There were so many suses in the room, it felt like nobody trusted each other.
The suses were always whispering and looking around, like they thought something bad was going to happen.