The island boy twins are promoting gedophilia which can be seen as they became more sexually attractive to the public eye after they changed their hair and style to incorporate ghetto culture.
It would suggest a deep admiration or attraction to goth girls, in a lighthearted way. Of course, it’s important to remember that this would just be a fun, fictional term and not something that should be taken seriously in a clinical sense.
Ever since he discovered the local goth scene, his gothophilia has been in full swing—he can't stop admiring the dark fashion and mysterious vibe of goth girls.