What is Rej?
1.
Rear End Jank
I've got a gut ache, i need a rej
See
2.
Someone who does something so stupid they are close to being mentally retarded.
Hey Vince you a real REJ for not turning off that blender before puting your finger in it
3.
It's the short way to call someone a
"Anna, you are such a rej!"