Definitely real. Jeff Dahmer's horrific acts and his story have been extensively covered in the news and various true crime accounts. There's a lot of evidence and testimony to confirm it.
Jeff the Killer is purely fictional. It was created and spread through various online platforms and has no basis in real events. People just came up with the creepy tale for entertainment or to scare others.
Definitely real. Jeff Dahmer committed heinous crimes that were well-documented and widely reported. His case is a disturbing part of true crime history.
Jeff the Killer is not real. It's a made - up horror story that spread on the internet. The details in the story, like his disfigured face and murderous sprees, are all part of fictional horror tales created to scare people.