A metaphorical term used to describe a person so foul and Dumb or Mentally Challenged that they surely must have been born a Butt baby through the rear.
Dude Noah is so dumb he has to be a butt baby for sure!
Haha yeah his dad probably left because he was so ashamed that his beautiful boy was a butt baby product
After a ass blasting a sperm cell attaches to a turn and it will develop into a baby
my BUTT BABY has a extra chromosome
A very large bowel movement that could be described as "as big as a baby".
She clogged up the toilet with her butt baby.