Fanfiction written about youtubers Dan Howell (danisnotonfire) and Phil Lester (AmazingPhil) but instead of a dan/phil slash pairing, its pairs each one with a girl.
It is the combination of the words Phan and vagina.
Omg. That phangina fix about Dan/Cat and Phil/Leila was soo good. Phileila is now my otp.