The child born to a woman who had unprotected anal sex. The semen from the rectum drained (throughout daily activities, standing, walking, etc.) and eventually made its way down to her vagina, where it proceeded to impregnate her. It is possible. Mind you.
I fucked Mandie in the ass without a condom last night. She said it leaked and got in her pussy, she might have a butthole baby.
by Rob October 3, 2003
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When you are dropping a deuce, and it is so wide it feels like you just pooped out a small baby.
"Wow Jon, I just took a crap and I think I may have done some permanant damage with that last butthole baby."
by Aaron Wassman May 3, 2007
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The giver sprinkles a ramen noodles seasoning packet in the ass of the receiver while the receiver boils the 0 gram transfat noodles in the asshole of the giver. The couple then scissors their buttholes until the noodles and seasoning mix. Then you eat it while watching dumb and dumber 2
Michael gave me the butthole baby diet last night and I am still shitting out seasoning.
by Barneybigdick January 27, 2015
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