A cross between a Pegina (Penis+Vagina) and an Anus. Sexual intercourse with such a mythical sexual organ is referred to as simultaneous double penetration. This mythical organ is believed to be the production of pheromone abuse in a combination with hemaphroditism.
They can also be considered the combination of a Vaginus (Vagina+Anus) and a penis; or a Penus (Penis+Anus) and a vagina.
Man #1: Dude, last night I had sex with a Peginus, it was the best thing ever!
Man #2: Dude, you were fucking high, those things dont exist!
Man #1: What are you talking about, I fuck one very week!