J-Factor
A person who can 'j' (or jizz) in real life or a game when something cool happens. Kids who haven't gone through puberty can't do this, so they're out of luck.
My friend screamed 'J!' when he beat the boss in the game.
I j'd during the final exam when I realized I had extra time.
She j'd in the middle of a math test because she thought the teacher was going to cry.