someone really suspicious or creepy

Internet persona(s) who happens to follow you and you happen to follow them back and maintain communication with and have a mutual liking for eachother whether it be friendship wise, etc. (Mutuals if more than one mutual)

A joke developed in a highschool. A school bus full of sus boys going to a basketball tournament they know they were gonna lose. One boy sent a pornographic image and from then on it was known as the sus bus. Now everybody says it, not knowing where it's from

A suspicious looking vehicle.

It is a bus full of sus fuckboys who are gey as fuck

Someone who is very, very sus. The person upon whom the term is being bestowed should be so incredibly sus that there is no return from the susness.

A faggot, A Dickhead, An asshole, Someone who likes boys so much he is a dick to everyone.