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3.
An alternate name for a retarded person. This is insinuating that the man or woman is retarded because he/she came out of his or her mother's asshole when they were born.
Jon was in all sped classes and he ate his own sperm so we locked him in a cage and called him a poop baby.
by KBB123 May 02, 2007
 
1.
The result of semen leaking from the penis during anal sex into the vagina and impregnating the woman. The resulting child is thus, a poop baby.
I always wondered why Davis was so weird...until I found out he was a poop baby.
by Mary Shelley April 03, 2007
 
2.
A poop so giant it feels like you just pushed a baby out of your butt.
OH MAN I JUST HAD A POOP BABY! I think I'll name it George.
by Poopmama February 15, 2009