The act of fully inserting one's cranium into a women's vagina and ideally crawling into her womb. It is the reverse of the birthing process, specifically crowning. It is advisable to cover one's head in a balloon of some sort in order to maximize pleasure.
Guy: Dude, I want to finger that chick.
Experienced Friend: No man, you gotta try reverse crowning.
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.