The act of suffocating someone with a large pair of breasts, usually a D cup or larger. This usually occurs when someone tries to motorboat a girl and it goes horribly wrong, causing him to asphyxiate within the girl's breasts.
John: Bro, did you hear about Dave?
Nick: No, what happened?
John: He was trying to motorboat some hot chick with a huge rack, but got lost in there and died.
Nick: Dude... *shakes head*
John: Yeah, the coroner said cause of death was accidental breastphyxiation.
Nick: No, what happened?
John: He was trying to motorboat some hot chick with a huge rack, but got lost in there and died.
Nick: Dude... *shakes head*
John: Yeah, the coroner said cause of death was accidental breastphyxiation.
by AngelTheFallen July 1, 2015