A medical phenomenon where a newborn infant achieves an erection while passing through the birth canal. The sensation that the infant experiences when his erection comes into contact with his mother's vulva may sometimes cause small amounts of ejaculation. This ejaculate will either shoot onto the delivering doctor's face (see: bukkake), or will enter the mother's vaginal opening. In the instance of the latter, the mother may become pregnant with her newborn son's semen. The resulting child will be the product of the Boner Baby's. Because Boner Baby Syndrome (BBS) is a hereditary trait, the cycle may continue indefinitely.

Consequently, those born with a hermaphroditic condition (also known as Ensignitis) may also be capable of BBS.

Lawmakers and moral philosophers have argued for decades over whether or not the sexual contact between a mother and her newborn son is considered consensual or rape.
"Because Lutz was born a Boner Baby, his younger brother was also his son. His life was wracked with confusion. This (and, of course, myriad other reasons) prevented him from losing his virginity until he was 46."

"Dana was alarmed to learn that, after a long and difficult labor process, that she was impregnated again by her own son Loh. However, she describes the sensation as 'the most AEPhantastic orgasm I've ever experienced'."

"Ensign I fucking hate you, you hermaphrodite"
by Pastel Redd February 3, 2012
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Baby boner? really? Baby boner.... is a babies boner
My baby gets a lot of baby boners
by luvestospluge May 8, 2014
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You wake up you think you got the real thing but you got a trouser full of baby boner which couldnt even touch the sides on a bag of dicks
"Hey mate I got a baby boner"

"can it touch the sides on a bag of dicks?"

"Na"
by Joby-one July 18, 2019
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