Duffy

A form of pedophile that knows full well what they're doing is disgusting, yet continues to do it anyway.
Derived from a guy named Kyle Duffield, who would do exactly this.

Normal dude: Bro you're 27, stop looking at little girls. That's fucked up
Duffy: I know, honestly I think its disgusting
Normal dude: Then why the fuck are you doing it? You're a fucking Duffy bro