The term was coined off an actual couple named Mai and Bryan who are still sucking each other's faces off, much to the dismay of the people around them.
Sally: Sure, why not. Who do you want to invite? Alice?
Ben:Oh.. well Alice and I don't really chill anymore, ever since she met Bill.
Sally: What happened?
Ben: She pulled a Mai and Bryan.
Sally: Oh, I see. Her loss.