It's similar to a Deez Nuts joke but more stylish/similar to "Get Fucked"
Jack: Hey how about you eat deez nuts * throws some nuts *
Jinson: Ouch!
Jack: Haha, get Deez Nutz'ed!
A fear of the game Friday Night Funkin' or for short, FNF.
Hey why doesn't Johnny want to play FNF?
He has Funkinphobia.