The aftermath of a furious session of butt sex, butt babies are the resultant mix of shit and cum that is ejected from the recipient's asshole at their next dump.
After taking dick in the ass, Mattia delivered a healthy 1lb. butt baby the next time he went to the restroom.
by UvaFML November 3, 2009
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A child that is concieved by anal sex.
Gestation occurs in the lower intestine and the baby is born through the anal sphincter which dilates (to up to a foot) in diameter for this purpose.
I always thought anal sex was the most reliable form of contraception until i got pregnant with a butt baby and contracted herpes.
by Farmer Fife August 30, 2004
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This refers to a broad category of mentally or physically deformed individuals. Unfortunately for these people, they were conceived after semen seeped from their respective mother's anuses into their vaginas after anal sex. This mixture of fecal matter and sperm, that fertilized their mother's eggs, often produced ghoulish offspring that are genetically predisposed to being very unattractive or educationally inept.
One could say that they passed a short bus full of butt-babies on their home from work or that they saw the maturing process of a butt-baby by watching "Texas Chainsaw Massacre: The Beginning".
by C-Murdah April 5, 2007
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Butt Babies is a term used mainly by homosexual men to tell another man that they would like them to ejaculate in their butt.
Durk: I want you to fuck my ass.
Lewis: I want you cum in your ass!
Durk: Lets make Butt Babies together!!!
by Buttsauce January 28, 2008
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A fictional baby conceived by anal intercourse and birthed through the anus, just as a regular baby is conceived by sexual intercourse and birthed through the vagina.

In reality it is impossible to impregnate anyone or give birth through the anus. Mentioning or discussing the concept of a butt baby is a pursuit into often intentionally juvenile humour.
John: "Shut up, you butt baby!"

Rick: "Hey, us butt babies are contributing members of society! We are all equal, whether born from the hoo-ha or born from the ha-hoo."
by DanielCornelius September 7, 2012
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Noun; When a man takes a shit so big that it stretches out his asshole. The result is a very large stool that could be the size of a small child.
Man 1, "I took the hugest shit ever just now!"

Man 2, "How big was it?"

Man 1, "It was a Butt Baby!"
by Ronnie Kimbel February 25, 2010
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While performing sloppy anal sex with little to no care; if semen is allowed to drip from the anus into the vagina what we now know as a butt baby has the potential of being conceived. Butt babies are quite obviously identified as their overwhelming need to whine about everything and their pungent odor that will never fade.

UPDATE: Warning! It has been confirmed that a dirty toilet seat can also result in becoming pregnant with a butt baby!
Daryl: I hate that douche Scott. I can't believe he has a job here, I don't even think he is capable of dressing himself.

Bill: Dude... Scott is a butt baby, stop being so judgmental and put yourself in his poopy shoes for a hot minute.

Daryl: Oh man, I had no idea... now I feel like a butt baby.
by Cuddlesworth October 13, 2015
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