An SJ is the actually correct name for what is commonly referred to as a blowjob, or BJ. The SJ, or suckjob, describes what is actually happening. SJ is not to be confused with S.J., which stands for Society of Jesus. Though, to be fair, both do promote good in the world.
Damn dude, that girl Lizzy gives such a good SJ.
A term used to talk shit about a guy that can easily lay your ass out. SJ's are typically roid raged douche bags that think they kick ass although after high school they'll be working as a janitor. Often heard making animalistic grunting noises.
Guy1: Shit! dude SJ heard us!
Guy2: Fuck now he's gonna whoop our asses
SJ: Huh! Why the fuck are you doing that shit?