n. The sexual act of inserting your head into your partner's vagina. Best if done wearing a heavily lubricated swim cap. Also used as a verb.
n. That bitch is so loose, even Charlie Brown could hit a reverse birth on her.

He tried to reverse birth Giggles, but she was just too tight.

or

The last time I reverse birthed a girl, my swim cap got stuck up there.
by Elliot Simon March 13, 2005
A reverse birth (also know as Baby Dildo), is the act of pleasing a stubborn, unpleaseable woman, by taking a newborn and sticking it back into the vagina, inevitably giving her an orgasm.
"Dude, that bitch? Nothin' was gettin' her off. So I gave her a nice baby dildo and she finally appreciated what I was doing for her."

"I felt bad about fuckin' her man, you know after her husband died? So I figured I'd involve her kid, and I helped her reminisce. I totally gave her a reverse birth."
by ladiesman23 October 15, 2009
To acquire ownership of something, usually incarnate, by forcefully pushing said object into ones vagina (or anus) then subsequently pushing it out in an act of "birth." This is commonly done, but not limited to, aesthetically pleasing children that you wish to make yours.
"Oh Alex!!" Laura said with utmost excitement, "Isn't baby Ben S00 cute! I will make him my own flesh and blood by reverse birthing him!"
by thed00d! September 07, 2008
To acquire ownership of something, usually incarnate, by forcefully pushing said object into ones vagina (or anus) then subsequently pushing it out in an act of "birth." This is commonly done, but not limited to, aesthetically pleasing children that you wish to make yours.
"Oh Alex!!" Laura said with utmost excitement, "Isn't baby Benji larsman S00 cute! I will make him my own flesh and blood by reverse birthing him!"
by thed00d! October 11, 2008

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