For some reason, I can see it being something like this:
Girl asks Sam to come around her house, to chillax.
Girl phones 20 of her girl mates, and also invites them around to her house.
Sam arrives, to be met by 21 girls, they circle him, and then start a chant of 'Sam has a Mangina, Sam has a Mangina!' for a hour.
Sam returns home, a broken man, and finds comfort in playing fifa with his mates, who also all, coincidently, have manginas.