Reverse Mabifica is the romantic pairing between reverse Mabel and reverse Pacifica. This ship first came to place after Reverse Falls, an A.U. that switches everybody’s personalities. In this A.U. Pacifica is switched with Dipper Pines. This makes Pacifica a dorky, slightly awkward nerd with supportive parents. Mabel, in this A.U. is switches roles with Gideon Gleeful. This makes her a rude, stuck-up girl with magical powers from a brooch and a large, Yandere-like crush on Gideon.
This ship largely appeals to people who already ship Mabifica in canon.