Jeffobia is the fear of the main character from the popular creepypasta Jeff the Killer, in which a child gets bleached and becomes a murderer. Try to not talk about "JTK" around people who suffer from this.
1:Yo you hear that 3 has Jeffobia?
2:Oh shit really? I guess we can't talk about Jeff anymore.
3:Wait do you mean J-J-Jeff the K-Killer????
2:uh oh
3:AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA