9jizz is when you jizz in your pants immediately after opening 9gag. These people fap to rage comics and think they are gangsta after using Meme Phrases like "like a boss" "forever alone" "fap,fap,fap" in public.
Matteo: So this guy was like the boss?
Robbert: LOLOLOLOL LIKE A BOSS #YOLO
Jenna:Ugh he probably just 9jizzed in his pants.