When a new baby is born, before the umbilical cord is cut, the baby is immediately placed in the mother's asscheeks. This may be difficult so placing the newborn child as far up in there as possible is the main objective. According to legend the first child this act was ever done to was named Mary.
An individual or team of men who are infamous for going through the backdoor. Backdoor Bandits know that if the front door is being painted to go around back.
Friend: did you see that new sex tape that Christy was in?
Friend2: yeah man, looks like multiple backdoor bandits beat that up.
When you and another guy are pounding a chick in the ass and vagina. And it's like a reverse Tug O War where both men push inside the girl trying to force the other one out with their penis while still inside her ass and pussy.
This hot bitch had two guys in her and they were having a "Backdoor Tug O War"