Imaginary future personfriend
A non-existent person who would be your girlfriend/boyfriend/enbyfriend (or significant other) someday.
Dude: "Hey, where are you going?"
Bro: "I'm going out with my imaginary future personfriend."
Dude: "Uhhh..."
Bro: "I'm going out with my imaginary future personfriend."
Dude: "Uhhh..."