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A child born as the result of butt sex.
My boyfriend and I were doing it the "Greek Way" when I noticed something fall out of my vag. A butt baby!
Butt Baby by Deadbehbeh December 27, 2008
A butt baby is a person that looks like the combination of two male celebrities or men you know
That guy looks like Leonard Nemoy and William Shatner had an illegitimate butt baby
Butt Baby by Mooseburgers June 14, 2018
When a guy comes up behind a girl and grinds them. Most often, the action is unsolicited.
At the club last night, I had to stay close to my friends because so many guys were trying to make butt babies with me.

I don't wanna make a butt baby with you!
Butt Baby by tinybubbles95065 June 19, 2010
Sam: Yo man did you hear Terry just had a real butt baby.
Jake: Yeah man that baby stinks.
Sam: They should really watch it.
Butt Baby by Aruuuu May 15, 2016
A very large bowel movement that could be described as "as big as a baby".
She clogged up the toilet with her butt baby.
Butt Baby by Knewellsc June 12, 2018
After a ass blasting a sperm cell attaches to a turn and it will develop into a baby
Butt baby by dad gone May 17, 2021